This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'BCG vaccine in HIV (+) newborn is: \nSelect and explain. \nA. Contraindicated, B. Double dilution, C. Half dilution, D. Dose double', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans (a)BCG vaccine should not be given to infants and children with active HIV disease. Babies born to mother with AFB positive spectum should not be given BCG at birth, but only after a course of preventive chemotherapy.', 'role': 'assistant'}]