This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'A 50-year-old male presented with fever and chills along with chest pain during cough. His sputum specimen was cultured on blood agar, showed the presence of a-hemolytic colonies the next day. The fuher processing of this organism is most likely to yield \nSelect and explain. \nA. Gram- negative coccobacilli, catalase positive and oxidase positive, B. Gram- positive cocci in clusters, catalase positive and coagulase positive, C. Gram- positive cocci in pairs, catalase negative and bile soluble, D. Gram- positive cocci in sho chains, catalase negative and bile resistant', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Growth of alpha-hemolytic colonies, which are isolated from the sputum of a patient, is suggestive of pneumococcal pneumonia. Pneumococci are gram-positive cocci in pairs, catalase negative, and bile soluble Reference: Ananthanarayan and Paniker&;s Textbook of Microbiology Tenth edition', 'role': 'assistant'}]