Efficacy and Safety of Riociguat in Patients With Symptomatic Pulmonary Hypertension (PH) Associated With Idiopathic Interstitial Pneumonias (IIP)

* Inclusion Criteria: * Men or women aged from ≥18 to ≤80 years * Diagnosed with one of the following (confirmed using a multidisciplinary approach, as per ATS(American Thoracic Society) / ERS(European Respiratory Society) / JRS (Japanese Respiratory Society) / ALAT(Latin American Thoracic Association) guidelines: * Major IIPs (idiopathic interstitial pneumonias) diagnosis or suspected as one of the following: * Idiopathic pulmonary fibrosis * Idiopathic nonspecific interstitial pneumonia * Respiratory bronchiolitis-interstitial lung disease * Desquamative interstitial pneumonia * Cryptogenic organizing pneumonia * Acute interstitial pneumonia * Rare IIPs diagnosis by one of the following: * Idiopathic lymphoid interstitial pneumonia * Idiopathic pleuroparenchymal fibroelastosis * Unclassifiable idiopathic interstitial pneumonias * Forced Vital Capacity (FVC) ≥ 45 % * 6MWD (6 minutes walking distance) ≥ 150 m to ≤ 450 m {under stable O2(oxygen) supplementation via nasal cannula} * Diagnosis of PH (pulmonary hypertension) confirmed by right heart catheter (RHC) with (mean artery pulmonary artery pressure )mPAP ≥ 25 mmHg and (pulmonary artery wedge pressure)PAWP ≤15 mmHg at rest * Systolic blood pressure (SBP) ≥ 95 mmHg and no signs or symptoms of hypotension * WHO functional class II-IV * Women of childbearing potential can only be included in the study if a pregnancy test is negative. Women of childbearing potential must agree to use adequate contracept…