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
Facial nerve palsy can be caused by ? 
Select and explain. 
A. Cholesteatoma, B. Multiple sclerosis, C. Mastoidectomy, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. is 'd'' i.e., All of the above Causes of facial paralysis Central :- Brain abscess, pontine glioma, Polio, multiple sclerosis Intracranial pa (cerebellopontine angle) :- Acoustic neuroma, meningioma, congenital cholesteatoma, metastatic carcinoma, meningitis Intratemporal pa :- Idiopathic :- Bell's palsy, Melkersson's syndrome Infections :- ASOM, CSOM, Herpes zoster oticus, malignant otitis externa Trauma :- Surgical (mastoidectomy, stapedectomy), accidental (fractures of temporal bone) Neoplasms :- Malignancies of external and middle ear, glomus jugular, facial nerve neuroma, metastasis (from breast, lung etc). Extracranial pa :- Malignancies or surgery or injury to parotid gland Systemic diseases :- Diabetes, hypothyroidism, uremia, PAN, Sarcoidosis (Heerfordt's syndrome), leprosy, leukaemia, demyelinating disease