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[A] : Lymphocytes arise from bone marro...

[A] : Lymphocytes arise from bone marrow and present in the blood, lymph and connec- tive tissues.
[R]: Lymphocytes migrate to thymus. where they develop into T cells and begin to mature.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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Assertion. Lymphocytes arise from the stem cells present in the bone marrow and occur in the blood, lymph and connective tissues. Reason. Lymphocytes migrate to bursal lymphoid tissue or to thymus and differentiate into B or T-cells.

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