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: Microbiology
[{'content': "The culture medium used for corynebacterium diphtheriae \nSelect and explain. \nA. Loeffler's serum slope, B. Tetrathionate broth, C. Selenite 'F' broth, D. Chocolate agar", 'role': 'user'}, {'content': 'Answer: A \nExplanation: • The usual media employed for cultivation of diphtheria bacillus are\n1) Loeffler’s serum slope\n■ It is used for rapid diagnosis as growth is shown within 4-8 hours.\n2) Tellurite blood agar (Tinsdale medium)\n■ It acts as selective media, as tellurite inhibits the growth of most other bacteria.\n■ Growth may take two days to appear.', 'role': 'assistant'}]