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: Pediatrics
5 year old child with pseudomembrane in throat, fever, sore throat, organism is ? 
Select and explain. 
A. Comma shaped gram negative bacilli, B. Club shaped gram positive bacilli, C. Spore forming gram positive bacilli, D. Filamentous gram positive bacilli
B: Club shaped gram positive bacilli
Answer: B: Club shaped gram positive bacilli 
Explanation: Ans. is 'b' i.e., Club shaped gram positive bacilli Corney bacterium diphtheria Non motile, non-capsulated, club shaped gram positive bacillus. Infect nasopharynx & release exotoxin which cause local inflamation of epithelial surface, formation of membrane (pseudomembrane) and toxemia.