This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
An 8 years old child is having sore throat with grey-white membrane in throat. Throat swab culture is showing following growth. The causative organism is- 
Select and explain. 
A. Streptococcus pyogenes, B. H. influenzae, C. Corynebacterium, D. None
C: Corynebacterium
Answer: C: Corynebacterium 
Explanation: Ans. is 'c' i.e., Corynebacterium * Grey-white membrane in throat and block colonies on tellurite agar suggest the diagnosis of Diphtheria, caused by Corynebacterium diphtheriae.