| Which of the following is not a secondary lymphoid organ? |
| I. Lymph nodes |
| II. Bone marrow |
| III. Thymus |
| Identify the correct option |
A) I and II
B) I and III
C) II and III
D) I, II and III
Correct Answer: C
Solution :
Thymus and bone marrow are primary lymphoid organ, where T and B-lymphocytes mature.
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