What does that have to do with the price of tea in China?

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What does that have to do with the price of tea in China?

A rhetorical question calling attention to a non-sequitur or irrelevant statement or suggestion made by another person. Yes, I agree that health care is an important issue, but what does that have to do with the price of tea in China? We're discussing tax incentives for local businesses—not exactly a related topic!
See also: does, have, of, price, tea, that, to, what
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.