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
In primary pulmonary hypertension basic abnormality in gene lies in - 
Select and explain. 
A. Bone morphogenetic protein receptor II, B. Endothelin, C. Homeobox gene, D. PAX-11
A: Bone morphogenetic protein receptor II
Answer: A: Bone morphogenetic protein receptor II 
Explanation: None