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': 'Retraction of tympanic membrane touching the promontory. It is called ? \nSelect and explain. \nA. Mild retraction, B. Severe retraction, C. Atelectasis, D. Adhesive otitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., Atelectasis Tympanic membrane retraction The retracted segment of eardrum is often known as a retraction pocket. The terms "atelectasis" or sometimes "adhesive otitis media" can be used to describe retraction of a large area of the pars tensa.', 'role': 'assistant'}]