According to the sources, the pelvic girdle consists of two coxal bones, and each coxal bone is formed by the fusion of three specific bones: the ilium, ischium, and pubis . The other matches are incorrect because: (1) the three ear ossicles are the malleus, incus, and stapes, while the cochlea is a structure of the inner ear ; (2) actin and myosin are contractile muscle proteins, but rhodopsin is a protein found in the eye ; and (3) the nitrogenous pyrimidines found in nucleic acids are cytosine, uracil, and thymine, whereas thiamine is actually Vitamin B1 .