please explain also
Mark the incorrect statement
(1) MALT constitutes about 50% of lymphoid tissue
in human body
(2) Rheumatoid arthritis which affects many people
in our society is an autoimmune disease
(3) Immunisation or vaccination is based on the
property of memory of immune system
(4) Only CD4 cells participate in graft rejection

What are CD4 and CD8cells

The correct option is 4.
Not only CD4 helper cells but also MHC (major histocompatibility complex) plays important role in graft rejection.

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