Which of the following comprises the pelvic girdle?

The pelvic girdle is a crucial structure in the human skeleton that serves as the attachment point for the lower limbs and supports the weight of the upper body when sitting and standing. It comprises several specific bones that form a ring-like structure around the pelvis.

The correct set of bones that make up the pelvic girdle includes the ilium, pubis, ischium, and sacrum while the coccyx is often considered part of the pelvic structure as well. The ilium is the largest and topmost bone of the pelvis, the sacrum is located at the back and connects to the vertebral column, and the ischium and pubis complete the ring-like formation below. This configuration provides both stability and mobility necessary for bipedal locomotion.

The other options list bones that pertain to entirely different regions of the body. The second option consists of bones that form the shoulder girdle and upper limb, the third option includes facial bones, and the fourth consists of bones in the forearm and thigh. These choices do not relate to the architecture of the pelvic girdle, reinforcing why the first choice is the only correct answer regarding the pelvic girdle's anatomy.