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: ENT
[{'content': 'Pinna develops from \nSelect and explain. \nA. 1st pharyngeal arch, B. 1st and 3rd pharyngeal arch, C. 1st and 2nd pharyngeal arch, D. 2nd pharyngeal arch', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pinna\n\nIt develops from both 1st and 2nd brachial arches\nPeriod of development starts from 4–6 weeks and adult configuration is attained by 20th week\nFrom the', 'role': 'assistant'}]