Dead giveaway

Meaning: it is obvious what the answer is now that you have been told something
Example: The boy asked his mom if his mom or his dad would be driving him to school. His mom said, I can't drive you today. The son said, Well I guess that was a dead giveaway, dad must be driving today.
See this Idiom in a story: Santa Claus (Choose Your Own Adventure)

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dead giveaway