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 seen in - \nSelect and explain. \nA. Oropharynx, B. Nasopharynx, C. Cricopharynx, D. Vocal cords", 'role': 'user'}, {'content': "Answer: C \nExplanation: Between these two parts of inferior constrictor exists a potential gap called Killian's dehiscence.\nIt is also called the gateway to tear as perforation can occur at this site during esophagoscopy.\nIt is also the site for herniation of pharyngeal mucosa in case of the pharyngeal pouch.", 'role': 'assistant'}]