This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Tellurite stimulates growth of 
Select and explain. 
A. E. coil, B. Cl. Tetani, C. Corynebacterium diphtheriae, D. Salmonella
C: Corynebacterium diphtheriae
Answer: C: Corynebacterium diphtheriae 
Explanation: Tellurite inhibits the growth of most other bacteria acting as a selective agent for diphtheria bacilli. Diphtheria bacilli reduce Tellurite to metallic tellurium which is incorporated in colonies giving them a grey or black colour. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 242