The cranial bone(s) that forms the most posterior portion of the skull is/are the bone(s).

Correct Answer: B

Rationale: The occipital bone forms the posterior skull base and back, including the foramen magnum. The ethmoid is anterior, parietal is lateral, and sphenoid is central, making 'occipital' correct.

Correct Answer: B

Rationale: Scoliosis is an abnormal lateral (side-to-side) spine curvature. Kyphosis is forward curvature, lordosis is inward, and hunchback is colloquial for kyphosis, making 'scoliosis' correct.

Correct Answer: A

Rationale: In anatomical position (palms forward), the radius is lateral (thumb side) and the ulna medial (pinky side) in the forearm. Tibia and fibula are leg bones, making 'radius' correct.

Correct Answer: C

Rationale: The ischium, the lower posterior part of the coxal bone, is the most inferior, forming the sitz bones. The ilium is superior, pubis anterior, and acetabulum central, making 'Ischium' correct.

Correct Answer: A

Rationale: The coxal bone comprises ilium, ischium, and pubis, fusing at the acetabulum. The sacrum is a separate pelvic bone, not part of the coxal bone, making 'sacrum' correct.