In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to write a question that clarifies the given question in such a way that the generated question has one unique answer.
--------
Question: When did apple stop supporting safari for windows?

Answer: What year did apple stop supporting safari for windows?


Question: When was the first superman comic book published?

Answer: When was the first comic book featuring Superman published?


Question: Mexico is led by a chief of state who is?

Answer:
Mexico is led by a chief of state whose title is?