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: Medicine
Riociguat is used in the treatment of: 
Select and explain. 
A. Gouty ahritis, B. Rheumatoid ahritis, C. Chronic thromboembolic pulmonary hypeension, D. Obesity
C: Chronic thromboembolic pulmonary hypeension
Answer: C: Chronic thromboembolic pulmonary hypeension 
Explanation: Riociguat a soluble guanylate cyclase stimulator. It is the only therapy approved by USFDA for inoperable CTEPH (Chronic thromboembolic pulmonary hypeension). Best treatment for operable cases is pulmonary thromboendaerectomy done in expe centres. Reference: Ghofrani HA, D'Armini AM, Grimminger F, Hoeper MM, Jansa P, Kim NH, Mayer E, Simonneau G, Wilkins MR, Fritsch A, Neuser D, Weimann G, Wang C; CHEST-1 Study Group. Riociguat for the treatment of chronic thromboembolic pulmonary hypeension. N Engl J Med. 2013; 369:319-329