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
BCG vaccine is diluted with: September 2005 
Select and explain. 
A. Normal saline, B. Distilled water, C. Dextrose, D. Colloids
A: Normal saline
Answer: A: Normal saline 
Explanation: 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.