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
Which is not a pa of HACEK? 
Select and explain. 
A. Haemophilus Aphrophilus, B. Acinetobacter Baumannii, C. Cardiobacterium Hominis, D. Kingella Kingae
B: Acinetobacter Baumannii
Answer: B: Acinetobacter Baumannii 
Explanation: This is a group of small gram-negative rods that have in common the following: slow growth in culture, the requirement for high CO2 levels to grow in culture, and the ability to cause endocarditis. They are members of the human oropharyngeal flora and can enter the bloodstream from that site. The name "HACEK" is an acronym of the first letters of the genera of the following bacteria: Haemophilus aphrophilus and Haemophilus paraphrophilus, Actinobacillus actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, and Kingella kingae. Ref: Levinson W. (2012). Chapter 27. Minor Bacterial Pathogens. In W. Levinson (Ed), Review of Medical Microbiology & Immunology, 12e.