When en route from China to France, must pilots know their altitude in the imperial foot?
Most international airports and aviators use the foot to measure altitude. China and North Korea require pilots to use meters for altitude. Pilots must communicate their altitude with local air traffic control.
The answer is yes.

Do people watching Coen brothers films in Guinea Bissau need subtitles?
The Coen brothers direct films primarily using English. The primary languages used in Guinea Bissau are Creole, native African languages, and Portuguese.
The answer is yes.

Did polio medicine save the life of polio vaccine creator?
Jonas Salk developed the first polio vaccine. Jonas Salk died of a heart attack in 1995. Heart attacks are commonly treated with beta blockers.
The answer is no.

Would food made with black salt smell of sulfur?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Black Salt has is a kiln-fired rock salt that contains sulfur. When black salt is cooked with, it smells similar to rotten eggs. Rotten eggs smell like sulfur.
The answer is yes.