This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
Robe Koch assistant advised him to use agar instead of gelatine for solidifying culture media for cultivation of bacteria as - 
Select and explain. 
A. Agar has no more nutrition, B. Gelatin melts at 24degC, C. Gelatin is not easily available, D. Agar is cheaper
B: Gelatin melts at 24degC
Answer: B: Gelatin melts at 24degC 
Explanation: Gelatin melts at 24degC. REF:Textbook of Microbiology, Ananthanarayan, and Paniker. Page no.: 39