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
Reversed cold chain is used for: September 2010 
Select and explain. 
A. Transpoation of vaccines back from vaccination center to hospital, B. Transpoation of vaccine from hospital to vaccination center, C. A system of storing and transpoing samples at recommended temperatures from the point of collection to the laboratory, D. Transpoing oral polio vaccine only
C: A system of storing and transpoing samples at recommended temperatures from the point of collection to the laboratory
Answer: C: A system of storing and transpoing samples at recommended temperatures from the point of collection to the laboratory 
Explanation: Ans. C: A system of storing and transpoing samples at recommended temperatures from the point of collection to the laboratory The 'cold chain' is a system of storing and transpoing the vaccines at recommended temperatures from the point of manufacture to the point of use. There is also a concept called 'reverse cold chain', which is a system of storing and transpoing samples at recommended temperatures from the point of collection to the laboratory. The role of the cold chain is to maintain the potency of vaccines.