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
Which disease is prevented by giving booster dose to a 5-6 years old child? 
Select and explain. 
A. Measles, B. BCG, C. DT, D. DPT
D: DPT
Answer: D: DPT 
Explanation: None