Question

Which one of the following organs is not involved in the elicitation of immune responses?

Options

• Spleen

• Thymus

• Lymph nodes

• Brain

Answer 1

Brain

Explanation:

The spleen, thymus, and lymph nodes are all lymphoid organs involved in the elicitation of immune responses. The spleen and lymph nodes serve as sites for lymphocyte proliferation and filtration of pathogens, while the thymus is crucial for the maturation of T-lymphocytes. The brain, however, is not involved in generating or eliciting immune responses, as it is primarily a nervous system organ and does not participate in immune cell production or activation.