You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.

[Q]: Category: HOLIDAYS & OBSERVANCES 
Clue: Mexico defeated France at the Battle of Puebla on this date in 1862
[A]: fifth of may


[Q]: Category: WAITER! 
Clue: To get us started, a serving of this dish named for an oilman: oysters topped with spinach & then baked
[A]: oysters rockefeller


[Q]: Category: HOLIDAYS & OBSERVANCES 
Clue: Although first observed in 1909, it wasn't until 1972 that the third Sunday in June officially became this holiday
[A]:
father\'s day