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': 'Treatment of choice for sputum positive pulmonary tuberculosis detected in Ist trimester of pregnancy: \nSelect and explain. \nA. Defer till second trimester, B. Sta cat. I immediately, C. Sta cat. II immediately, D. Sta cat. III immediately', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sta cat. I immediately Repeat May 10', 'role': 'assistant'}]