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
Frozen DPT vaccine should be - 
Select and explain. 
A. Shaken thoroughly before use, B. Allowed to melt before use, C. Discarded, D. Brought to room temperature before use
C: Discarded
Answer: C: Discarded 
Explanation: None