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
Which of the following can be used for obtaining specimen for isolation of microorganism in laboratory diagnosis: 
Select and explain. 
A. Meningococcal rash, B. Blood in staphylococcal food poisoning, C. Throat swab in Rheumatic fever, D. Blood in post-streptococcal GN
A: Meningococcal rash
Answer: A: Meningococcal rash 
Explanation: Ans. is. a' i.e. Meningococcal rash