This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
What enhances multiplication of T cells in culture - 
Select and explain. 
A. Phytohemagglutinin, B. Chemotactic factor, C. Leukotrienes, D. Prostaglandins
A: Phytohemagglutinin
Answer: A: Phytohemagglutinin 
Explanation: Phytohemagglutinin: an initiator of mitosis in cultures of normal human leukocytes mainly T-cells Reff: www.mayoclinic.com