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
[{'content': 'Which of the following pleomorphic coccobacillus shows satellite phenomenon in blood agar? \nSelect and explain. \nA. Anaerobic staphylococci, B. H. influenzae, C. Corynebacterium diphtheria, D. Brucella abous', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Haemophilus influenzae is a small (1- by 0.3-mm) gram-negative organism of variable shape; hence, it is often described as a pleomorphic coccobacillus. On chocolate agar, flat, grayish brown colonies with diameters of 1-2 mm are present after 24 hours of incubation. H influenzae does not grow on sheep blood agar except around colonies of staphylococci "satellite phenomenon". Ref: (2013). Chapter 18. Haemophilus, Bordetella, Brucella, and Francisella. InBrooks G.F., Carroll K.C., Butel J.S., Morse S.A., Mietzner T.A. (Eds), Jawetz, Melnick, & Adelberg\'s Medical Microbiology, 26e.', 'role': 'assistant'}]