This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral cavity & Oesophagus, Subject name: ENT
[{'content': 'Esophagus Pierces the diaphragm at the level of \nSelect and explain. \nA. T 6 veebrae, B. T 8veebrae, C. T 10 veebrae, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Esophagus It is a fibromuscular tube, about 25 cm long in an adult. It extends from the lower end of pharynx (C6) to the cardiac end of stomach (T11). It shows three normal constrictions and it is impoant to know their location at oesophagoscopy. They are: 1. At pharyngo-oesophageal junction (C6)--15 cm from the upper incisors. 2. At crossing of arch of aoa and left main bronchus (T4)--25 cm from upper incisors. 3. Where it pierces the diaphragm (T10)--40 cm from upper incisors. Ref:- Dhingra; pg num:-340', 'role': 'assistant'}]