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
18 months old child, who has received one dose of DPT and OPV at 2 months of age. What will be your next immunization plan : 
Select and explain. 
A. Restart immunization schedule, as per age, B. Measles, BCG, booster dose of DPT and OPV, C. Measles, booster dose of DPT and OPV, D. BCG, 2ND dose of DPT and OPV
D: BCG, 2ND dose of DPT and OPV
Answer: D: BCG, 2ND dose of DPT and OPV 
Explanation: A lapse in the immunization schedule does not require reinitiation of entire vaccine series. Immunization should be given at the next visit in the usual doses assuming that the minimum interval has already elapsed and the imunization should be completed at the next available opportunity".
D.P.T. and oral polio vaccine which the child already had should be considered as the first dose.
The child would need further 2 doses of this vaccine to complete the primary vaccination.
Booster doses are administered, once the primary immunization is complete. Thus you cannot administer booster doses of D.P.T. and O.P.V. as their primary immunization is not complete.