Physics question? Need help!

Posted on 2014-12-22 12:42:00 in Physics by MICCO

Multiple choice question:

Which of these is not a hadron?

A. A Kaon.

B. A neutrino

C. A positron

D. A proton.



The answer is B. Can anyone tell me why the answer C doesn't qualify as well? Isn't positron an anti-electron? Won't it qualify as a lepton instead? Is there a fault in the question or is my understanding of a positron wrong?

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