Q: Which of these bones is not a part of the coxal bone?  

Answer: B

The coxal bone, also known as the hip bone, is formed by the fusion of three bones- the ilium, the ischium, and the pubis. The ilium is the largest of the three bones and forms the superior aspect of the hip bone. The ischium forms the posteroinferior aspect of the hip bone and is the bone that bears the weight of the body when sitting. The pubis is the anterior aspect of the hip bone and is joined to the pubis of the opposite hip bone by a fibrocartilaginous joint called the pubic symphysis. The acromion, on the other hand, is a part of the scapula, which is a bone of the shoulder girdle and is not a part of the coxal bone.

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