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: Microbiology
[{'content': 'A patient presents with signs of pneumonia. The bacterium obtained from sputum was a gram positive cocci which showed alpha hemolysis on sheep agar. Which of the following test will help to confirm the diagnosis? \nSelect and explain. \nA. Bile solubility, B. Coagulase test, C. Bacitracin sensitivity, D. CAMP test', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The bacteria in the question which is a gram positive cocci showing alpha hemolysis on sheep agar is Streptococcus pneumoniae. Optochin sensitivity and bile solubility tests can confirm its diagnosis. Ref: Essentials of Diagnostic Microbiology By Lisa Anne Shimeld, 1998, Page 120; The Science of Laboratory Diagnosis By David Burnett (Ph. D.), David Burnett, John Crocker, 2005, Page 138', 'role': 'assistant'}]