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 9 years old child presented to OPD with complaints of high grade fever, vomiting, one episode of seizure. CSF examination was done and Gram staining of the culture showed the following finding. What is the probable causative agent \nSelect and explain. \nA. Haemophilus influenzae, B. Streptococcus pneumoniae, C. Neisseria meningitidis, D. Escherichia coli', 'role': 'user'}, {'content': 'Answer: B \nExplanation: * Gram staining clearly shows Gram positive cocci (violet/purple coloured) in pairs - classical image of Streptococcus pneumoniae or pneumococci. Infections caused by Pneumococcus: - * Pneumonia * Meningitis * Otitis media * Bacteremia * Septic ahritis * It is the most impoant cause of infections in splenectomy patients, chronic alcoholics, sickle cell anaemia patients. Ref:- Ananthanarayan and Paniker T.B of microbiology 10th ed; pg num:- 225', 'role': 'assistant'}]