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': "A child come with fever, cold, cough, membrane over tonsils; nasal swab is taken, culture should be done on which medium for earliest diagnosis - \nSelect and explain. \nA. Loffler's serum slop, B. LJ. media, C. MC Conkey's Agar, D. Citrate media", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]