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
Selective medium for Gonococci - 
Select and explain. 
A. Thayer - martin medium, B. LJ medium, C. DCA medium, D. MacConkey's medium
A: Thayer - martin medium
Answer: A: Thayer - martin medium 
Explanation: None