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
Management of non Immunised diphtheria contacts include all except -a) Prophylactic pencillinb) Single dose of Toxoidc) Daily throat examinationsd) Throat swab culture 
Select and explain. 
A. bcd, B. acd, C. ac, D. bd
A: bcd
Answer: A: bcd 
Explanation: None