[单选题]
Particles that do not interact via*oqr m ogk;bi7: ps6d1 the strong force but do interact 1g1 u lw11 ziv(ezy/fhvia the weak nuclear force (and presumably by the much whlfye( 11vzgiz1 1u /weaker gravitation force) are called
A. gauge bosons.
B. leptons.
C. baryons.
D. mesons.
