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: Pediatrics
Rubella specific antibodies detected after vaccination/ natural infection: March 2013 
Select and explain. 
A. IgM, B. IgG, C. IgA, D. IgE
B: IgG
Answer: B: IgG 
Explanation: Ans. B i.e. IgG Test for rubella specific antibody (IgM) should be done within 10 days of the exposure to know whether the patient is immune or not. Rubella specific IgG antibodies are present for life after natural infection or vaccination