Choose from options: Determine if the sentence is true based on the text below:
Vaccination against cat flu are not considered an essential vaccine. 

How to prevent feline upper respiratory illness<br>Get your cat vaccinated. Vaccination against cat flu is considered an essential vaccine. The flu vaccine needs to be given regularly and it comes in a variety of types (modified live, modified live intranasal, killed vaccine) which determines how often the vaccine needs to be given.
pick from the following.
[A]. Yes;
[B]. It's impossible to say;
[C]. No;
[C].