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: Medicine
42 year old male presented with high grade fever with hepatosplenomegaly. At the time of admission he was very sick. On detailed evaluation doctor noticed a skin lesion on the thigh suggestive of eschar. Patient was diagnosed to have srub typhus. He is BEST treated with: 
Select and explain. 
A. Oral Doxycycline, B. Oral Erythromycin, C. IV ceftriaxone, D. IV gentamicin
A: Oral Doxycycline
Answer: A: Oral Doxycycline 
Explanation: Srub typhus patients presents with high fever, eschar, regional lymphadenopathy. It is treated with: DOC: Oral doxycycline 100 BD for 7-14 days Alternatives, Azithromycin 500 for 3 days or chloramphenicol Ref: Harrison, Edition-18, Page.