This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
A 20 years old male patient presents to the STD clinic with a genital ulcer. The gram stain of the smear from ulcer shows gram negative coccobacilli. The most appropriate media for culture would be: 
Select and explain. 
A. Thayer Main Medium, B. Blood agar with X & V factors, C. Chocolate agar with IsoVitaleX, D. Teilurite blood agar
C: Chocolate agar with IsoVitaleX
Answer: C: Chocolate agar with IsoVitaleX 
Explanation: The clinical picture is suggestive of soft sore (chancroid) caused by Haemophilus ducreyi. Chocolate agar with IsoVitaleX is used for its culture. Other culture media: Thayer Main Medium - Gonococci Blood agar with X & V factors - Haemophilus influenzae Tellurite blood agar - Corynbacterium diphtheriae Reference: Ananthanarayan and Paniker&;s Textbook of Microbiology Tenth edition