Which muscle tilts the pelvis posteriorly?

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Multiple Choice

Which muscle tilts the pelvis posteriorly?

Explanation:
Posterior pelvic tilt comes from muscles that extend the hip and pull the pelvis backward. The semimembranosus is one of the hamstrings crossing the hip joint; when it contracts, it extends the hip, which rotates the pelvis into a backward tilt. Other options don’t primarily pull the pelvis backward: the vastus intermedius mainly extends the knee, not the hip; gluteus medius acts mainly to abduct the thigh and stabilize the pelvis; and adductor longus mainly adducts the thigh (with some flexion) and does not produce posterior tilt.

Posterior pelvic tilt comes from muscles that extend the hip and pull the pelvis backward. The semimembranosus is one of the hamstrings crossing the hip joint; when it contracts, it extends the hip, which rotates the pelvis into a backward tilt. Other options don’t primarily pull the pelvis backward: the vastus intermedius mainly extends the knee, not the hip; gluteus medius acts mainly to abduct the thigh and stabilize the pelvis; and adductor longus mainly adducts the thigh (with some flexion) and does not produce posterior tilt.

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