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: Social & Preventive Medicine
[{'content': 'The diluent used for BCG is ? \nSelect and explain. \nA. Distilled water, B. Normal saline, C. Dextrose solution, D. Ringer - lactate', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Normal saline", 'role': 'assistant'}]