This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Several antiviral compounds have been developed during the last decade. One such compound is ribavirin, a synthetic nucleoside structurally related to guanosine. Ribavirin therapy has been successfully used against 
Select and explain. 
A. Respiratory syncytial virus, B. Herpes simplex virus, C. Hepatitis B, D. Group A coxsackievirus
A: Respiratory syncytial virus
Answer: A: Respiratory syncytial virus 
Explanation: Ribavirin is effective to varying degrees against several RNA- and DNA-containing viruses in vitro. It has been approved for aerosol treatment of respiratory syncytial virus infections in infants. Intravenous administration has proved effective in treating Lassa fever.