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': 'Approximate distance of diphragmatic constriction from nostril & incisor are \nSelect and explain. \nA. 7" & 6", B. 11\' & 10", C. 17" & 16", D. 23" & 22"', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. 17" & 16"', 'role': 'assistant'}]