This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
All are true about stored blood, except 
Select and explain. 
A. Can be stored for 40 days, B. Good source of platelets, C. Levels of Potassium increased, D. Deficient Factors V and VIII
B: Good source of platelets
Answer: B: Good source of platelets 
Explanation: (B) Good source of platelets> Potassium intoxication; Stored blood may contain up to 30 mmol/l of potassium by its expiry date.> Citrate intoxication may cause tremors, arrhythmias, acidosis and hypocalcaemia.> Like platelets, clotting factors VIII and V are labile and their levels fall quickly.> Currently blood is allowed to be kept in blood banks for up to 42 days# Stored blood is deficient of:> WBC> Platelets (after 24 hours)> Factors V and VIII> CPD blood has a shelf- life of 3 weeks.> In stored blood the RBC suffer a temporary reduction after 24 hours in their ability to release oxygen to the tissues of recipients.> So if massive transfusion is required 2 units of blood < 7 days old is transfused.> Storage temperature -> - 4degC +- 2degC.(Source: Website)