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: Dental
What should be the gelation temperature of agar? 
Select and explain. 
A. 70-100 degrees centigrade, B. 37-45 degrees centigrade, C. 50-60 degrees centigrade, D. 30-40 degrees centigrade
B: 37-45 degrees centigrade
Answer: B: 37-45 degrees centigrade 
Explanation: Liquefaction temperature → 70-100o C
Gelation temperature → 37-45o C, just above oral cavity temperature.