All of the following compounds are mitogens that stimulate human T cells to proliferate, EXCEPT:: (A) Lipopolysaccharide, (B) Concanavalin A, (C) Anti CD3 antibody, (D) Phytohemagglutinin
Answer is A. All of the listed compounds are T-cell mitogens except lipopolysaccharide, which is a B-cell mitogen. Ref: Harrison's Principles of Internal Medicine, 17th Edition, Chapter 310, Page 2055