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
Gram negative cocci is/are -a) Neisseria gonorrhoeaeb)  Bacillusc) Staphylococcid) Streptococcie) Neisseria meningitidis 
Select and explain. 
A. ae, B. b, C. ab, D. ad
A: ae
Answer: A: ae 
Explanation: Medically important gram negative cocci
1) Neisseria

Strict (obligate) aerobes → Meningococci
Facultative anaerobes     → Gonococci

2) Veillonella (obligate anaerobes)
Note → All other medically important gram negative bacteria are bacilli (including coccobacillus).