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 65 years old man presenting with complaints of chest pain, fever, cough with sputum. O/E of sputum, pus cells with gram positive cocci present. Blood agar showed positive result. How will you differentiate this from other gram positive cocci?a) Bacitracinb) Optochin sensitivityc) Bile solubilityd) Coagulase positivity \nSelect and explain. \nA. a, B. bc, C. ac, D. ad', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]