This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'a 2 year old child is brought to th er with h/o fever and vomiting.o/e hehas neck rigidity .the csf repo shows 2000/ml protien 100mg/dl the gram stain shows the presence of gram negtive bacilli the culture shows growth of bacteria only on choclate agar and not on blood agar the causative agent is : \nSelect and explain. \nA. neisseria mengitidis, B. heamophilus influenzae, C. bordotella peusis, D. streptococcus pyogens', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Haemophilus Influenzae Mode of Transmission: Droplet infection and discharge from the upper respiratory tract during the infectious period. Incubation Period Unknown, probably sho, 2-4 days. Infectious Period - As long as the organism is present, even in the absence of nasal discharge. - Noninfectious within 24 to 48 hours after the sta of effective Haemophilus influenza type b Medical Management * Hospitalization required * Treatment with an effective 3rd generation cephalosporin, or chloramphenicol plus ampicillin * Ampicillin-resistant strains now common throughout the United States ref : ananthanaryana 9th ed', 'role': 'assistant'}]