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': 'Which of the following can be used for obtaining specimen for isolation of microorganism in laboratory diagnosis: \nSelect and explain. \nA. Meningococcal rash, B. Blood in staphylococcal food poisoning, C. Throat swab in Rheumatic fever, D. Blood in post-streptococcal GN', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is. a' i.e. Meningococcal rash", 'role': 'assistant'}]