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: Unknown
[{'content': 'Ehrlichia chaffeensis is causative agent of \nSelect and explain. \nA. Human monocytic ehrlichiosis, B. Human granulocytic ehrlichiosis, C. Glandular fever, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ehrlichiae\nThese are gram negative, obligate intracellular bacteria which have affinity towards blood cells,\nThey grow within phagosomes of phagocytes as mulberry-like clusters called morula.\nThey are tick-borne.\nThree human infections caused by this group of organisms have been identified :-\n\xa0\nHuman monocytic ehrlichiosis (HME)\nIt is caused by E. chaffeensis, and transmitted by Amblyomma ticks.\nDeer and rodents are believed to be reservoir hosts.\nThere is leukopenia, thrombocytopenia and elevated liver enzymes.\n\xa0\n2) Human granulocytic ehrlichiosis (HGE)\nIt is caused by E. equi (E. phagocytophila), and transmitted by ixodes ticks.\nDeer, cattle and sheep are suspected reservoirs.\nThere is leucopenia and thrombocytopenia.\n\xa0\nGlandular like fever\nIt is caused by Ehrlichia sennetsu\nNo arthopod vector has been identified and infection is caused by ingestion offish carrying infected flukes.\nTheres is lymphoid hyperplasia with atypical lymphocytosis.\nDoxycvcline is recommended for treatment of ehrlichiosis.', 'role': 'assistant'}]