This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': 'Atypical pneumonia can be caused by the following microbial agents except? \nSelect and explain. \nA. Mycoplasma pneumoniae, B. Legionella pneumophila, C. Human Corona virus, D. Klebsiella pneumoniae', 'role': 'user'}, {'content': "Answer: D \nExplanation: Mycoplasma pneumonia is the most common cause of atypical pneumonia. Legionella pneumophila also causes legionnaires pneumoniae which is also a type of atypical pneumonia. Human coronavirus also causes atypical pneumonia Klebsiella pneumoniae causes lobar pneumonia which is typical pneumonia. Klebsiella pneumoniae is also known as Friedlander's bacillus which produces red currant jelly sputum and shows bulging fissure signs on chest X-ray.", 'role': 'assistant'}]