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: Surgery
Which condition causes the maximum hearing loss? 
Select and explain. 
A. Ossicular disruption with intact tymnpanic membrane, B. Disruption of melleus and incus as well tympanic membrane, C. Paial fixation of the stapes footplate, D. Otitis media with effusion
A: Ossicular disruption with intact tymnpanic membrane
Answer: A: Ossicular disruption with intact tymnpanic membrane 
Explanation: Average Hearing loss seen in different lesions of conductive apparatus: Complete obstruction of ear canal = 30dB Perforation of tympanic membrane (it varies and is directly propoional to the size of perforation) = 10-40 dB Ossicular interruption with intact drum = 54 Db Closure of oval window = 60 Db