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
Example of selective medium is: 
Select and explain. 
A. LJ medium, B. Blood agar, C. Selenite F broth, D. Chocolate agar
A: LJ medium
Answer: A: LJ medium 
Explanation: Ans. is. 'a' i. e., LJ medium