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: Anatomy
[{'content': 'Clavipectoral fascia is not pierced by: \nSelect and explain. \nA. Medial pectoral nerve, B. Lateral pectoral nerve, C. Cephalic vein, D. Thoracoacromian aery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The upper poion of the clavipectoral fascia, the costocoracoid membrane, is pierced by the cephalic vein, the lateral pectoral nerve, and branches of the thoracoacromial trunk. The medial pectoral nerve does not pierce the costocoracoid membrane but enters the deep surface of the pectoralis minor.', 'role': 'assistant'}]