This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
Doxycycline is used in the treatment of following disease except: 
Select and explain. 
A. Leptopirosis, B. Q fever, C. Borreliosis, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: TETRACYCLINES These are a class of antibiotics having a nucleus of four cyclic rings. The tetracyclines still available in India for clinical use are: Tetracycline Oxytetracycline Demeclocycline Doxycycline Minocycline Uses: Although tetracyclines are broad-spectrum antibiotics, they should be employed only for those infections for which a more selective and less toxic AMA is not available. Clinical use of tetracyclines has very much declined due to availability of fluoroquinolones and other efficacious AMAs. USES: >Mild leptospirosis is treated with doxycycline, ampicillin, or amoxicillin. For severe leptospirosis, intravenous penicillin G has long been the drug of choice, although the third-generation cephalosporins cefotaxime and ceftriaxone have become widely used. >Rickettsial infections: typhus, rocky mountain spotted fever, Q fever, etc. respond dramatically. Chloramphenicol is an alternative. >Relapsing fever* due to Borrelia recurrentis responds adequately ESSENTIALS OF MEDICAL PHARMACOLOGY, www.medscape.com K.D.TRIPATHI SIXTH EDITION PAGE NO:715