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
Indicator used in Macconkey medium 
Select and explain. 
A. Methyl violet, B. Gentian violet, C. Neutral red, D. Carbol fuschin
C: Neutral red
Answer: C: Neutral red 
Explanation: Macconkey's medium contains peptone, Lactose, agar, neutral red and taurocholate.