This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infectious disease, Subject name: Pediatrics
[{'content': 'In a 3 year old most common cause of Hepatitis B is \nSelect and explain. \nA. Pin prick, B. Saliva exchange, C. Perinatal, D. Blood transfusion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: *HBV is transmitted through contact with blood and body fluids of an infected person . *In highly endemic areas , HBV infections occur mainly due to perinatal transmission resulting from carrier mothers to their infants during first 5 years of life. * It may also occur through horizontal transmission from casual contact . * HBV is not transmitted by breastfeeding Reference : OP Ghai pgno 217 9th edition.', 'role': 'assistant'}]