<prompt> A 70 year old man with a known history of Parkinsons disease is to receive prophylaxis against Influenza A virus. He is given a drug that is useful against Parkinsons disease as well for prophylaxis against influenza. The drug with which of the following mechanisms of action is most likely to have been given?It prevents entry and penetration of the virusIt prevents uncoating of the virusIt prevents replication of the virusIt prevents assembly of newly synthesized virus paicles  <response>: The drug that is used for both Parkinson;s and influenza is amantadine which is a dopamine facilitator or agonist. It acts by preventing the uncoating of viral paicles.Ref: HL Sharma 3rd ed Pg: 797 