[Answer] 5. He was brother to the hell gate guardian Orthrus, at least according to Greek mythology. He had a distinctive physical appearance and it was a Herculean task to bring him to heel. Which monstrous dog am I describing?

Step 1 : Introduction to the question "5. He was brother to the hell gate guardian Orthrus, at least according to Greek mythology. He had a distinctive physical appearance and it was a Herculean task to bring him to heel. Which monstrous dog am I describing?"

...1. Canis 2. Bran 3. Barghest 4. Cerberus In Greek mythology Cerberus was the gigantic hound which guarded the gates of Hades. He was described as a three-headed dog with a serpent's tail, a mane of snakes, and a lion's claws. One of the extra clues I embedded in the question referred to a Herculean task. This was because one of the twelve 'Labours of Hercules' was to fetch Cerberus from the underworld.

[Answer] In what year did San Francisco's Golden Gate Bridge open? 1923 1937 1941 1945

Step 1 : Introduction to the question "In what year did San Francisco's Golden Gate Bridge open?"

..The Golden Gate Bridge is a suspension bridge spanning the Golden Gate, the one-mile-wide (1.6 km) strait connecting San Francisco Bay and the Pacific Ocean. The structure links the American city of San Francisco, California – the northern tip of the San Francisco Peninsula – to Marin County, carrying both U.S. Route 101 and California State Route 1 across the strait. The bridge is one of the most internationally recognized symbols of San Francisco, California, and the United States. It has been declared one of the Wonders of the Modern World by the American Society of Civil Engineers

Step 2 : Answer to the question "In what year did San Francisco's Golden Gate Bridge open?"

1937:

The Frommer's travel guide describes the Golden Gate Bridge as "possibly the most beautiful, certainly the most photographed, bridge in the world." At the time of its opening in 1937, it was both the longest and the tallest suspension bridge in the world, with a main span of 4,200 feet (1,280 m) and a total height of 746 feet (227 m).

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[Ans] What is the official color of the Golden Gate Bridge?

Step 1 : Introduction to the question "What is the official color of the Golden Gate Bridge?"

...Why is the Golden Gate Bridge that color? The international orange paint used on the Golden Gate Bridge is specially formulated to protect the bridge from the danger of rust from salt spray off the ocean, and from the moisture of the San Francisco fog that frequently rolls in from the Pacific Ocean through the Golden Gate to San Francisco Bay. International orange - Wikipedia 

 Why is it called the Golden Gate Bridge when its red? The Bridge is actually named for the Golden Gate Strait, the narrow entrance between the Pacific Ocean and the San Francisco Bay. The strait was named by explorer and U.S. Army officer John C. Frémont, who marveled at its beauty in 1846—two years before the discovery of gold in California.