This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
All are capsulated bacteria except - 
Select and explain. 
A. Neisseria, B. Corynebacterium diphtheriae, C. Haemophillus, D. Streptococcus saliverius
B: Corynebacterium diphtheriae
Answer: B: Corynebacterium diphtheriae 
Explanation: The diphtheria bacillus are pleomorphic, nonsporing noncapsulated and nonmotile they are gram-positive .pleomorphic, nonspoing, encapsulated, nonmotile gram-positive bacteria REF:Ananthanarayan and Panikkar's textbook of microbiology 9th edition pg no 236