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: Medicine
The most common cause of facial palsy is - 
Select and explain. 
A. Bell's palsy, B. Cuillain-Bare syndrome, C. Parotid tumour, D. Injury to the facial nerve
A: Bell's palsy
Answer: A: Bell's palsy 
Explanation: None