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
Which is the latest antiviral drug for bronchitis due to RSV- 
Select and explain. 
A. Ribavarin, B. Acyclovir, C. Amantadine, D. Idoxuridine
A: Ribavarin
Answer: A: Ribavarin 
Explanation: None