<prompt> Which of the following statements best describes a hapten?Haptens activate T cellsPenicillin is a haptenHaptens do not react with specific antibodyHaptens bind the major histocompatibility complex  <response>: Haptens react with antibodies but they are not immunogenic. They do not activate T cells and cannot bind the major histocompatibility complex. Penicillin is a hapten and can cause severe life threatening allergic reaction. 