This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Malabsorbtion Syndrome, Subject name: Medicine
[{'content': 'A patient with undulating fever presents with features of encephalitis. He is treated successfully with doxycycline and rifampicin. What shall be the most probable diagnosis: \nSelect and explain. \nA. Brucellosis, B. Bordetella peussis, C. Francessila tularensis, D. Mycoplasma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Brucellosis/Malta / Mediterranean / Undulant fever Caused by B. Melitensis Development of meningo-encephalitis Rx DOC-Doxycycline WHO regimen recommends doxycycline and Rifampicin. Bordetella Peussis-Causes whooping cough / 100 days fever Francisella Tularensis After contact with rabbit bites causes Tularemia eschar positive enlarged LN. Mycoplasma pneumonia-Causes atypical Pneumonia Choice B leads to peussis Choice C leads to ulcero-glandular fever and presence of eschar Choice D present as atypical pneumonia Hence the answer by exclusion is brucellosis', 'role': 'assistant'}]