This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower limb, Subject name: Anatomy
Muscle causing flexion of hip 
Select and explain. 
A. Biceps femoris, B. Psoas major, C. Gluteus maximus, D. Tensor fasciae latae
B: Psoas major
Answer: B: Psoas major 
Explanation: Hip flexion is brought about by the action of iliopsoas aided by the rectus femoris ,saorius, and pectineus.Tensor fasciae latae(TFL) aids gluteus minimus and medius in abduction and medial rotation.Gluteus maximus helps in extension and lateral rotation.Biceps femoris helps inflexionReference : Clinical Anatomy for students, a problem solving approach, Neeta v Kulkarni, 2nd edition, page no.932