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': "Killian's dehiscence is in \nSelect and explain. \nA. Superior constrictor, B. Inferior constrictor, C. Middle constrictor, D. None", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Inferior constrictor muscle has two parts. \nThyropharyngeus with oblique fibres and cricopharyngeus with transverse fibres.\nBetween these two parts exists a potential gap called "Killian\'s dehiscence". It is also called "Gateway of tears". \nThis is also the site of herniation of pharyngeal mucosa in case of the pharyngeal pouch.', 'role': 'assistant'}]