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

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

1. (rhetorical question, colloquial, sarcastic) A comment used to indicate that a previous comment is irrelevant or unimportant.

   A: "I read that Wi-Fi radiation kills the cells of the body." – B: "What medications are you taking?" – A: "And what does that have to do with the price of tea in China?"

   • 1972, American School Counselor Association, The School counselor, volume 20, page 7:

     My reaction is "What does this have to do with the price of tea in China?"

   • 2000, United States Senate, Committee on Agriculture, Nutrition, and Forestry, Agricultural trade options: hearing before the Committee on Agriculture, Nutrition, and Forestry‎, →ISBN Invalid ISBN, page 103:

     "To quote the old saying, what does that have to do with the price of tea in China...? Talk about totally irrelevant."