This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'The main action of muscle "Gamellius" is? \nSelect and explain. \nA. Medial rotation of thigh, B. Lateral rotation of thigh, C. Gluteus maximus, D. Gluteus medius and minimus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Gemellus muscle laterally rotates the femur at the hip joint. Superior gemellus muscle: Attaches proximally at the ischial spine; distally, the muscle attaches on the greater trochanter of the femur. The nerve to the obturator internus and superior gemellus muscles (L5, S1, S2) innervates this muscle.Inferior gemellus muscle: Attaches proximally on the ischial spine; distally, the muscle attaches at the greater trochanter of the femur. The nerve to the inferior gemellus and quadratus femoris muscles (L4, L5, S1) innervates this muscle.', 'role': 'assistant'}]