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
Each day carrier can carry how many vaccine ls? 
Select and explain. 
A. 4-Feb, B. 8-Jun, C. 10-Aug, D. 16-20
B: 8-Jun
Answer: B: 8-Jun 
Explanation: A day carrier can carry 6 to 8 vaccine ls. 2 frozen ice packs are used. Vaccines can be stored in aday carrier for a few hours. Ref: Park 21st edition, page 103.