This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
Which one of the following ollowing is true - 
Select and explain. 
A. Agar has nutrient propeies, B. Chocolate medium is selective medium, C. Addition of selective substances in a solid medium is called enrichment media, D. Nutrient broth is basal medium
D: Nutrient broth is basal medium
Answer: D: Nutrient broth is basal medium 
Explanation: Ananthanarayan & Panicker's Textbook of Microbiology 9th edition pg no:39-40 Agar has no nutritive value it is formed from seaweeds.it is universally used to prepare solid media Chocolate agar is an eg of enriched media they are used to grow bacteria which are more extracting in their nutritional needs Enrichment media: some substances which added to a medium may inhibit the growth of the unwanted bacteria and absolutely increasing the number of wanted bacteria in the liquid media