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
The most common cause of lower motor neuron facial palsy is - 
Select and explain. 
A. Cholesteatoma, B. Cerebello-pontine angle tumors, C. Bell's palsy, D. Postoperative (ear surgery)
C: Bell's palsy
Answer: C: Bell's palsy 
Explanation: The commonest cause of facial palsy is idiopathic or Bell's palsy, which is a LMN type of palsy.