[单选题]
Particles that do not inrk(lo0gx w2v, u njj;9teract via the s9x adx5/2sgl)omq3z z trong force but do interact via the weak nuclear force (and presumably by the much weaker gravitation fo92)qlgdzx / 53 xamozsrce) are called
A. gauge bosons.
B. leptons.
C. baryons.
D. mesons.
