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
[{'content': 'Flexor of hip joints are all except \nSelect and explain. \nA. Psaoas major, B. Saorius, C. Gluteus maximus, D. Rectus femoris', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Muscles assisting in flexion are psoas major ,iliacus,saorius ,rectus femoris and pectineus. Gluteus maximus is the chief extensor of the hip joint. Reference: Textbook of anatomy,Abdomen and Lower limb, Vishram Singh, 2nd editon, page no.383', 'role': 'assistant'}]