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
A child has a respiratory infection with a membrane over Peritonsillar area. A swab was taken from the local area. The appropriate media for culture is 
Select and explain. 
A. LJ media, B. Blood tellurite media, C. Cary media, D. Loeffler serum slope
B: Blood tellurite media
Answer: B: Blood tellurite media 
Explanation: A common cause of respiratory infection with a membrane over the tonsil is Corynebacterium diphtheriae. Media appropriate for culture is Tellurite blood agar: 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 the colonies giving them a grey or black color. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 242