This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Culture media and method, Subject name: Microbiology
Agar is added to Broth medium: 
Select and explain. 
A. To make the medium liquid, B. To make the medium solid, C. To provide extra nutrition to grow, D. None
B: To make the medium solid
Answer: B: To make the medium solid 
Explanation: Ans. B. To make the medium solida. Broth media can be made solid by adding agar, a gel like polysaccharide extracted from red algae,b. Broth with about 1.5% agar added will be liquid when heated, but solid at room temperature, making it easy to pour into a vessel, such as a Petri dish or test tube when hot.c. The solution then becomes solid once cooled.