Question

Which of the following is/are the primary lymphatic organs?

• A. The red bone marrow of flat bones.
• B. The red bone marrow in the epiphyses of long bones of adults.
• C. Thymus.
• D. All of these.

Answer 1

Answer: (D)

Primary lymphoid organs are bone marrow and thymus. B-cells attain maturity in bone marrow and T-cells in thymus.