This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
Shelf life of CPD blood is 
Select and explain. 
A. 3 weeks, B. 6 weeks, C. 9 weeks, D. 12 weeks
A: 3 weeks
Answer: A: 3 weeks 
Explanation: CPD - shelf life of blood stored in CPD stored at 2 to 4C is 21 days CPD:Citric acid Phosphate dextrose