<prompt> All are the histological features of Pulmonary hypertension -a Capillaritis of alveolar septab Saddle thrombi in pulmonary trunkc Thrombi in pulmonary vasculature d Vaso-occlusive diseasee Arterial wall thickencdeacdbdeade  <response>: Pulmonary Hypertension In pulmonary hypertension pathological changes are seen from main pulmonary arteries to arterioles. They are :a Arterioles and small pulmonary arteries :i Medial hypertrophyii Thickening and reduplication of elastic lamina.iii Plexiform pulmonary arteriopathy in which intraluminal tuft of capillary formation occurs in dilated thin walled arteriolar branches.b Medium sized Pulmonary arteries :i Medial hypertrophy; which is not marked in secondary pulmonary hypertension.ii Concentric intimal thickeningiii Adventitial fibrosisivThickening and reduplication of elastic laminae.c Large Pulmonary arteries :Atheromatous depositsVasoocclusive disease itself may lead to pulmonary hypertension. 