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': 'Type of T-lymphocyte responsible for histocompatibility reaction is - \nSelect and explain. \nA. Suppressor T-cell, B. Activator T-cell, C. Effector T-cell, D. Helper T-cell', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]