What Is the Purpose of Treatment with Amantadine (Symmetrel)

What is the purpose of treatment with amantadine (Symmetrel) ?

A) To prevent viral pneumonia if taken regularly.
B) To prevent avian flu if taken at the first signs and symptoms of disease.
C) To lessen the severity of type A flu symptoms if taken within 48 hours of exposure.
D) To reduce irritation of bronchitis if taken weekly.