This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
Lactose fermentation is seen in - 
Select and explain. 
A. Blood agar, B. Chocolate agar, C. MacConkey agar, D. LJ medium
C: MacConkey agar
Answer: C: MacConkey agar 
Explanation: Ans. is 'c' i.e., MacConkey agar o Culture on differential media that contain special dyes and carbohydrates distinguishes lactose-fermenting (colored) from non-lactose-fermenting (non-pigmented) colonies and may allow rapid presumptive identification of enteric bacteria.o Such media, used to see lactose fermentation, are :-Eosine-methylene blue (EMB)MacConkey's agarDeoxycholate agar