This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Types of vaccines, Subject name: Pediatrics
[{'content': 'How much time does it take for the finding shown below, after BCG vaccination? \nSelect and explain. \nA. 1-2 days, B. 1-2 weeks, C. 2-4 weeks, D. 6-12 weeks', 'role': 'user'}, {'content': 'Answer: D \nExplanation: - BCG vaccine is administered at inseion of deltoid on left shoulder - to allow easy identification of its scar Changes after BCG vaccination: - Intradermal injection using 26G needle raises 5-7mm wheal - It occurs by following sequence of events Bacilli multiply - form a papule - by 1 week which enlarges to 4-8 mm Ulcerates - by 5-6 weeks Heals by scarring - by 6-12 weeks Route of administration : intradermal', 'role': 'assistant'}]