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': "C. diphtheriae is also called as: \nSelect and explain. \nA. Pfeffiers bacilli, B. Whitmore bacilli, C. Robert Koch bacilli, D. Kleb-Loeffler's bacilli", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Klebs-Loeffler bacillus(Ref: Ananthanarayan, 9th/e, 236 and 8th/e, p. 232)The diphtheria bacillus was first observed and described by Klebs but was first cultivated by Loeffler(1884). Therefore, it is known as Klebs-Loeffler Bacillus (KLB).", 'role': 'assistant'}]