This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscles of Lower Limb, Subject name: Anatomy
Strongest flexor of the hip joint is: 
Select and explain. 
A. Saorius, B. Gluteus maximus, C. Iliopsoas, D. Pectineus
C: Iliopsoas
Answer: C: Iliopsoas 
Explanation: Iliopsoas is the chief Flexor at hip joint, assisted by Saorius and Pectineus as the accessory muscles. Gluteus Maximus is the chief Extensor at hip joint, assisted by hamstrings as the accessory muscles.