This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'The following is a B cell specific mitogen: \nSelect and explain. \nA. Concanavalin A (conA), B. Lipopolysaccharide (LPS), C. Pokeweed mitogen (PWM), D. Phytohaemagglutinin (PHA)', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mitogens: Molecules that promote cellular mitosis in a non-specific way are known as mitogens. They activate lymphocytes but bypass antigen receptor specificity. Concanavalin A (conA), Phytohaemagglutinin (PHA) and wheat gram agglutinin (WGA) promote human T cell proliferation. Lipopolysaccharide (LPS) is specific for B cell, while Pokeweed mitogen (PWM) promotes both T cell and B cell. Ref: Analytical Techniques, edited by T.P. Mommsen, Peter W. Hochachka, Page 346, 347 ; The Immune Response: Basic and Clinical Principles, By Tak W. Mak, Mary E. Saunders, Page 387', 'role': 'assistant'}]