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
The main action of muscle "Gamellius" is: 
Select and explain. 
A. Medial rotation of thigh, B. Lateral rotation of thigh, C. Flexion of thigh, D. Extension of thigh
B: Lateral rotation of thigh
Answer: B: Lateral rotation of thigh 
Explanation: Lateral rotation of thigh