This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'True statement regarding branchial anomalies \nSelect and explain. \nA. Most commonly second arch is involved, B. Cyst is less common than sinus, C. No 1st arch anomalies are seen, D. Internal draining sinuses are most common', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]