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': 'BCG vaccine is diluted with: September 2005 \nSelect and explain. \nA. Normal saline, B. Distilled water, C. Dextrose, D. Colloids', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: Normal saline BCG Vaccine (Freeze-Dried) for intracutaneous administration, as prepared by Connaught Laboratories Limited, is made from a culture of an attenuated strain of living bovine tubercle bacillus (Bacillus Calmette-Guerin). It is supplied as a freeze-dried product ready for immediate use following reconstitution with the accompanying diluent, which consists of sterile phosphate-buffered normal saline. Distilled water may cause irritation.', 'role': 'assistant'}]