Assertion :Tumor cells have been shown to avoid detection and destruction by immune system. Reason: Cancer cells are recognised as self cells by the hosts immune system and are therefore not attacked.

Assertion and reason both are false. Assertion is true but reason is false. Both assertion and reason are true and reason is the correct explanation of assertion . Both assertion and reason are true and reason is not the correct explanation of assertion .

Both assertion and reason are true and reason is the correct explanation of assertion .

Tumor cells have been shown to avoid detection and destruction by immune system because cancer cells are recognised as self cells by the hosts immune system and are therefore not attacked. Therefore, the patients are given substances called biological response modifiers such as α-interferon which activates their immune system and helps in destroying the tumor.