You will be given a definition of a task first, then some input of the task.
You will be given a passage, and your task is to generate a Yes/No question that is answerable based on the given passage.

Coca tea is legal in Colombia, Peru, Bolivia, Argentina, Ecuador, and Chile. However, its use is being discouraged in part by the Single Convention on Narcotic Drugs. Coca tea is illegal in the United States unless it is decocainized.
Output:
is coca leaf tea legal in the us?