Myasthenia gravis is due to

Which of the following cells are associated with immune system of body

Assertion : Interferons are effective against viruses.

Reason : Proteins which can be synthesized only by genetic engineering are effective against viruses.

‘First line of defence' is known as

Assertion : Organ transplantation patients are given immunosuppressive drugs.

Reason : Transplanted tissue has antigens which stimulate the specific immune response of the recipient.

Grafted kidney may be rejected in a patient due to