Which of the following is not made by quarks?

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(B) Quarks are elementary particles that combine to form composite particles known as hadrons. Protons and neutrons are baryons,which are made of thre

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Positron

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(B) Quarks are elementary particles that combine to form composite particles known as hadrons. Protons and neutrons are baryons,which are made of three quarks. $\pi$-mesons (pions) are mesons,which are made of a quark and an antiquark. $A$ positron is an antiparticle of the electron,which is a lepton. Leptons are fundamental particles and are not composed of quarks. Therefore,the positron is not made of quarks.

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