This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
TCBS agar is for? 
Select and explain. 
A. Leptospira, B. Vibrio, C. Legionela, D. Bacteroides
B: Vibrio
Answer: B: Vibrio 
Explanation: Ans. b (Vibrio)# The Vibrio organism appears as gram-negative, curved, motile bacilli.# The A subunit of the Vibrio enterotoxin activates adenyl cyclase, resulting in the hypersecretion of water, sodium, potassium, chloride, and bicarbonate into the intestine (diahrrea).# Vibrio gastroenteritis or cholera are associated with consumption of contaminated seafood or water.# Vibrio vulnificus is associated with cellulitis caused by trauma incurred in a seawater environment and carries a high mortality rate if not treated rapidly.# Vibrio species require salt for growth and can be differentiated from other organisms by growth on TCBS agar.