This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neisseria, Subject name: Microbiology
Which of the following is gram negative diplococci: 
Select and explain. 
A. Cornynebacterium Diphtheriae, B. Neisseria Meningitidis, C. Streptococcus pneumoniae, D. Staphylococcus
B: Neisseria Meningitidis
Answer: B: Neisseria Meningitidis 
Explanation: Ans. (b) Neisseria MeningitidisRef: Microbiology by Ananthanarayan and Paniker 8th ed. /224-25MENINGOCOCCI* Meningococci are Gram negative diplococci* Strep. Pneumoniae is a gram positive diplococci.* Corynebacterium Diphtheriae is Gram positive bacillus. They are non-motile, non-sporing and non-acid fast.* Staphylococcus are Gram positive cocci. They are also non-motile, non-spore forming, non-acid fast.