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: Surgery
Ramsay Hunt syndrome is caused by infection of: 
Select and explain. 
A. Herpex simplex, B. Varicella zoster, C. Adenovirus, D. Picornavirus
B: Varicella zoster
Answer: B: Varicella zoster 
Explanation: Varicella zoster virus may also cause facial nerve paralysis when the virus reactivates from dormancy in the nerve. This condition, known as Ramsay Hunt syndrome, is characterized by severe otalgia followed by the eruption of vesicles of the external ear. Treatment is similar to Bell's palsy, but full recovery is only seen in approximately two thirds of cases. Ref: Schwaz's principle of surgery 9th edition, chapter 18.