[单选题]
Particles that do no4t 0 zj zzm+g;lhhgy2.t interact via th1o3vh68fbu iqe strong force but do interact via the weak nuclear force (and presumably by the much wei6 h8 u3of1vqbaker gravitation force) are called
A. gauge bosons.
B. leptons.
C. baryons.
D. mesons.
