This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'The central pa of cholesteatoma contains which of the following? \nSelect and explain. \nA. Keratin debris, B. Keratinized squamous epithelium, C. Coulmnar epithelium, D. Fibroblasts', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cholesteatoma consist of two pas: 1. Matrix is made up of keratinizing squamous epithelium resting on a thin stroma of fibrous tissue. 2. The central pa consists of keratin debris produced by matrix. For this reason, it has also been named epidermis or keratoma. Ref: PL Dhingra 7th edition of Ear, Nose and Throat; Pg no 73', 'role': 'assistant'}]