[单选题]
Particles that do not interacq)a/tm hxt;p/ima)./7.lik /x dga bpzf 2xa)t via the d9w6muoj; n6p4yjuo5 strong force but do interact via the weak nucleadu u4 n6y;jpmoo9w6j 5r force (and presumably by the much weaker gravitation force) are called
A. gauge bosons.
B. leptons.
C. baryons.
D. mesons.
