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
If a 11-month old child has received two doses of DPI and polio, comes for further immunization after 5 months of the last dose, what should be done ? 
Select and explain. 
A. Repeat the whole course, B. Repeat the 2nd dose and continue rest of the course, C. Give 3rd dose and continue the course, D. Give only booster dose
A: Repeat the whole course
Answer: A: Repeat the whole course 
Explanation: None