Why do women ask questions when the answer is blatantly obvious?

For instance, just the other day, I repaired some damage to my son's wall in his bedroom and was finishing up painting it. Well, my wife asks me, "So you found the right paint huh?". I didn't answer 'cause I figured you could tell. I mean there was the can with the right color in it. I thought it was funny, but she got all crabby, lol, god bless her. Anyways, throughout all my years, women have always done that, ask the obvious. What gives ladies?!
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Hmmm, a conversation starter? I suppose so...*scratches head*. Funny thing is, I never have to ask silly questions to start a conversation. Maybe I'm just being critical. I should work on that huh?
Why do women ask questions when the answer is blatantly obvious?
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