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
[{'content': 'Muscle most commonly affected by congenital absence is - \nSelect and explain. \nA. Pectoralis major, B. Semimembranosus, C. Teres minor, D. Gluteus maximus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pectoralis major and minor muscles are the most common congenitally absent muscles in human.', 'role': 'assistant'}]