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
[{'content': 'All of the following statements are true about diphtheria except: \nSelect and explain. \nA. Toxin production depends on lysogenic conversion by beta phage, B. Non sporing, non-motile and non-capsulated, C. Toxin detection is done by ELISA test in serum, D. Faucial diphtheria is commonest type', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Toxin detection is done by ELISA test in serum.Toxin is produced locally and is absorbed from the local site of multiplication causing toxemia. However, toxin may not always be detectable in the serum.', 'role': 'assistant'}]