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
[{'content': 'Robe Koch assistant advised him to use agar instead of gelatine for solidifying culture media for cultivation of bacteria as - \nSelect and explain. \nA. Agar has no more nutrition, B. Gelatin melts at 24degC, C. Gelatin is not easily available, D. Agar is cheaper', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Gelatin melts at 24degC. REF:Textbook of Microbiology, Ananthanarayan, and Paniker. Page no.: 39', 'role': 'assistant'}]