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': 'Which of the following conditions causes maximum hearing loss - \nSelect and explain. \nA. Ossicular disruption with intact tympic membrane, B. Disruption of malleus and incus with intact tympanic membrane, C. Partial fixation of the stapes footplate, D. Otitis media with effusion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]