This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable Diseases, Subject name: Social & Preventive Medicine
[{'content': 'Safe injection practices can prevent: \nSelect and explain. \nA. Hepatitis B, B. Hepatitis A, C. Typhoid, D. Hepatitis E', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: a (Hepatitis B)Ref: Park, 20th ed. Pg. 188Again a repeat question from 2008 Kerala, regarded as a zero value question and will gain significance when you make it wrong.', 'role': 'assistant'}]