Which of the following are primary lymphoid organs? bone marrow and thymus appendix and spleen lymph nodes and tonsils spleen and thymus

The correct answer is bone marrow and thymus

Explanation:

Primary lymphoid organs are bone marrow and thymus. Both organs consist of primary lymphoid tissue where B and T cells are produced.

Lymphocytes are also complete the early phases of maturation in the primary lymphatic organs in the body. In humans, B cells are generated and mature in the bone marrow. However, T cells are produced in the bone marrow and maturation takes place in the thymus.

Thus, the correct answer is the bone marrow and thymus gland.