Question

............. carry this hapten-carrier complex to the lymphatics.

• A. Monocytes
• B. Antigen presenting cells
• C. phagocytosis
• D. None of the above

Answer 1

Answer: (B)

Antigen presenting cells

A hapten is an incomplete antigen that can elicit an immune response only when attached to a large carrier such as a protein. When happens and carriers combine, the resulting molecule is called an adduct, that can elicit an immune response. Haptens cannot independently bind to MHC complexes, so they cannot be presented to T cells. But antigen presenting cells bind and carry this hapten-carrier complex to the lymphatics where they are destroyed. Thus the correct answer is option B.