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: Pathology
[{'content': 'Primary role of T-Lymphocytes is - \nSelect and explain. \nA. Antibody formation, B. Delayed hypersensitivity, C. Complement production, D. All of the above', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Delayed hypersensitivity", 'role': 'assistant'}]