Hershey and Chase proved that DNA is the genetic material while working on

Answer: Option A

Hershey and Chase proved that DNA is the genetic material while working on the Phage virus.
Hershey and Chase showed that when bacteriophages, which are composed of DNA and protein, infect bacteria, their DNA enters the host bacterial cell, but most of their protein does not.
Hershey and Chase and subsequent discoveries all served to prove that DNA is the hereditary material while working on bacteriophage virus.