Pseudomembrane over tonsil and pharynx is caused by: (A) Gram positive bacili, (B) Gram negative bacili, (C) SS RNA virus, (D) Catalase negative cocci
Answer is A. Pseudomembrane is formed in diphtheria, which is caused by Corynebacterium diphtheria, which is a gram-positive bacillus Ref: Harshmohan textbook of pathology; 7th edition