Answer:
The correct option is: b. attenuated vaccine
Explanation:
FluMist is the trade name of the live attenuated influenza vaccine, manufactured by MedImmune. This vaccine is used for the prevention of influenza, also called flu.
It is an attenuated vaccine which is given in the form of nasal spray.
An attenuated vaccine alters the pathogen by reducing its virulence and makes it harmless.