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: Unknown
[{'content': 'X-ray findings in chronic otitis media- \nSelect and explain. \nA. Honeycombing of mastoid, B. Sclerosis with cavity in mastoid, C. Clear-cut distinct bony partition between cells, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (Refer: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 73 – 82)\n“X-ray in CSOM, especially in atticoantral disease, may show sclerosis with presence of cavity”', 'role': 'assistant'}]