for It's a little formal, but fine.
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dimsumexpressIt'd sounds more natural to say: Could you tell me the reasonYes, it's morewhyyou didn't answer my question ...?"
PhilipThe reason I went to the doctor's office was that I didn't feel well. [not why I went; not because I didn't feel well]
dimsumexpressthe reason that I hate driving at night is because I can’t see too well after darkT