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': 'Management of non Immunised diphtheria contacts include all except -a) Prophylactic pencillinb) Single dose of Toxoidc) Daily throat examinationsd) Throat swab culture \nSelect and explain. \nA. bcd, B. acd, C. ac, D. bd', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]