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Q.

Which of the following are the reasons for rheumatoid arthritis?
(i) Lymphocytes become more active.
(ii) The body attacks self cells.
(iii) Deficiency of primary and secondary immune responses.
(iv) The ability to differentiate pathogens or foreign molecules from self cells is lost.
 

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a

i, iii and iv

b

ii, iii and iv

c

ii and iv

d

i and iv

answer is B.

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Detailed Solution

Due to genetic and other unknown reasons, the body attacks self-cells. The ability to distinguish between self and non-self cells is lost. This results in damage to the body and is called auto-immune disease. E.g., Rheumatoid arthritis 

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Which of the following are the reasons for rheumatoid arthritis?(i) Lymphocytes become more active.(ii) The body attacks self cells.(iii) Deficiency of primary and secondary immune responses.(iv) The ability to differentiate pathogens or foreign molecules from self cells is lost.