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 simplicity, answers should be in all lower cased letters.
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Question: Category: ADD A LETTER 
Clue: Confer if you wish, but if you add a letter to "confer", it becomes this type of evergreen

Answer: conifer


Question: Category: MOZART & FRIENDS 
Clue: Mozart wrote a lovely motet for Venanzio Rauzzini, one of these specially treated singers

Answer: a castrato


Question: Category: THE ANGEL GABRIEL 
Clue: In Christianity, Gabriel is considered to be one of these high-ranking angels like Michael & Raphael

Answer:
an archangel