In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.

Who has the most atp masters 1000 titles?
Rafael Nadal

When did brazil win the first world cup?
29 June 1958

Which three nations participated in the d-day operations in normandy?

United States, Great Britain, and Canada

