This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
How long will IVeponema pallidum survive in blood stored under oridanry refrigeration? 
Select and explain. 
A. Few hours, B. 1 week, C. 3 days, D. Several years
C: 3 days
Answer: C: 3 days 
Explanation: Treponema pallidum does not survive refrigeration for more than three days. Ref Harrison20th edition pg 1079