sub atomic particles proton neatron fall under the group of?

Question

options:mesons, photons,leptons,baryons..please explain

Answer 1

They fall into the Baryon category.......

Mesons are exchange particles with short life-times(i.e pi meson)
Photons are massless Energy carriers (EM Spectrum)
Leptons are the category that Electrons fall into.

See link....
http://en.wikipedia.org/wiki/Baryon