All of the following are groups of vertebrae except which is a curvature.
thoracic
cervical
lumbar
pelvic

The answer is Pelvic.

Explanation:

The following are groups of vertebrae: cervical, thoracic, lumbar. The pelvis is not part of this group. The pelvis is located at the bottom of the trunk. It is a funnel-shaped cavity (musculoskeletal) that narrows downward, limited by the sacral bone, the coccyx and the coxals, thus forming the pelvic girdle and the muscles of the lower abdominal wall and the peritoneum.

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