[单选题]
Particles that do not interact e4dn;he0 t voiarb ey 36 7q*uyg2k7.gvia the strong force but zu(v5v q2 1gpddo interact via the weak nuclear force (and presumably byv5v (gudp 12qz the much weaker gravitation force) are called
A. gauge bosons.
B. leptons.
C. baryons.
D. mesons.
