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
Which of the following parameters is used to determine the sensitivity of vaccine due to heat? 
Select and explain. 
A. VVM, B. VMV, C. VCM, D. VMM
A: VVM
Answer: A: VVM 
Explanation: Ans: A. VVMRef: K Park, 23'd ed, pg. 110VVM (Vaccine Vial Monitor)VVM is a label containing a heat-sensitive material which is placed on a vaccine l to register cumulative heat exposure over time.It has outer blue circle and inner white square.