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': 'A coin is struck at 25 cm from incisor in the esophagus, this place coincides with- \nSelect and explain. \nA. Cricopharyngeal junction, B. Bronchial bifurcation, C. Aortic arch, D. Oesophago-gastric junction', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Esophagus shows three normal constriction which are narrower portions of esophagus and foreign body can be held there.\nThese constrictions are : -\n\n\nAt pharyngo-esophageal junction (C6) - 15 cm from the upper incisors.\nAt crossing of arch of aorta and left main bronchus (T4) - 25 cm from upper incisors.\nWhere it pierces the diaphragm (T10) - 40 cm from upper incisors.', 'role': 'assistant'}]