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: Orthopaedics
Muscle most commonly affected by congenital absence is - 
Select and explain. 
A. Pectoralis major, B. Semimembranosus, C. Teres minor, D. Gluteus maximus
A: Pectoralis major
Answer: A: Pectoralis major 
Explanation: Pectoralis major and minor muscles are the most common congenitally absent muscles in human.