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
Post exposure active immunization can be done fora)  Rabiesb)  Measlesc)  Cholerad)  Yellow fever 
Select and explain. 
A. da, B. ab, C. da, D. ac
B: ab
Answer: B: ab 
Explanation: None