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
Extracranial complications of CSOM -a) Epidural abscessb) Facial nerve palsyc) Hearing lossd) Labyrinthitise) Sigmoid sinus thrombosis 
Select and explain. 
A. c, B. d, C. bd, D. ac
C: bd
Answer: C: bd 
Explanation: None