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 test, D. CAMP test', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]