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
Blood agar is an example of: 
Select and explain. 
A. Enrichment media, B. Enriched media, C. Nutrient media, D. Selective media
B: Enriched media
Answer: B: Enriched media 
Explanation: Blood agar is an example of enriched media. Enriched media are cultural media that are enriched with whole or lysed blood, serum, special extracts, or nutrients to suppo the growth of those bacteria that cannot grow on the basal media. Other examples of enriched media are serum agar and chocolate agar. Selenite F broth is an enrichment media used for the isolation of Salmonella group of bacteria. Selective media are solid media which contain substances that slow or inhibit the growth of micro-organisms other than those for which media are devised. Eg Tellurite medium for diphtheria, Deoxycholate citrate agar for Shigella and Salmonella. Ref: Medical Lab Science: Theory & Practice By Ochei Et Al, page 586