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
Clinical diphtheria is caused by - 
Select and explain. 
A. Corynebacterium diphtheriae, B. Corynebacterium parvum, C. C. ulcerans, D. Streptococcus pyogenes
A: Corynebacterium diphtheriae
Answer: A: Corynebacterium diphtheriae 
Explanation: Ans. is 'a' i.e., Corynebacterium diphtheriae Diphtheria is a nasophaiyngeal & skin infection caused by Corynebacterium diphtheriae