This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy (Neck), Subject name: Surgery
[{'content': 'Branchial cyst develops from- \nSelect and explain. \nA. 2nd branchial cleft, B. Is brachial arch, C. IIP arch, D. IV1h arch', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 2nd branchial cleft o Remnants of second branchial cleft are most common and are usually found in viscinity of anterior border of sternocleidomastoid.", 'role': 'assistant'}]