This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': "Corynebacterium diphtheriae can be grown within 6-8 hour on \nSelect and explain. \nA. Potassiu, tellurite media with iron, B. McConkey's agar, C. Dorset egg medium, D. Loeffler's serum slope", 'role': 'user'}, {'content': "Answer: D \nExplanation: The usual media employed for the cultivation of diphtheria bacilli are Loeffler's serum slope and Tellurite blood agar. Loeffler's serum slope: Diphtheria bacilli grow on Loeffler's serum slope very rapidly and colonies can be seen in 6-8 hours, long before other bacteria grow. Colonies are first small, circular white opaque discs but enlarge on continued incubation and may acquire a distinctly yellow tint. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 242", 'role': 'assistant'}]