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
Most common extracranial complication of ASOM is 
Select and explain. 
A. Facial nerve paralysis, B. Lateral sinus thrombosis, C. Subperiosteal abscess, D. Brain abscess
C: Subperiosteal abscess
Answer: C: Subperiosteal abscess 
Explanation: Pus may break through mastoid coex leading to subperiosteal abscess which may even burst on surface leading to a discharging fistula It occurs as a sequence of mastoiditis Ref: Dhingra 7e pg 84.