"All in?" asked as a question, not a statement - ruling?

[RR]

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2/5NL stacks irrelevant. After the river is dealt Player A bets 60.00, Player B raises to 200.00, Player A, says, "I'm all in", Player B responds "all in?" as a question, not a statement.

Ruling?

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He asked a question, h he should get an answer. He should also be more careful in how he asks the question as there are a lot of people out there that have no common sense and lack a basic understanding of poker rules and procedures.