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
Thrombocytopenia is an adverse reaction of which vaccine: 
Select and explain. 
A. BCG, B. DPT, C. MMR, D. Hep B
C: MMR
Answer: C: MMR 
Explanation: Thrombocytopenia is found as an adverse reaction of MMR vaccine. Usually mild and self-limiting, occasionally may need steroid or platelet. Ref: Park 21st edition, page 107.