Which of the following is absent in a virus?

In lichens,sexual reproduction belongs to

The polio virus is a ........

Algal viruses are known as

Assertion $A$: Viruses are considered as a link between living and non-living organisms.
Reason $R$: Viruses are non-living,but they are obligate parasites in living cells.
Which option is correct for Assertion $A$ and Reason $R$?

Which of the following scientists gave the name 'virus'?