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
The most common cause for chronic cor pulmonale is 
Select and explain. 
A. Recurrent pulmonary embolization, B. COPD, C. Cystic fibrosis, D. Bronchial Asthma
B: COPD
Answer: B: COPD 
Explanation: Answer is B (COPD): The most common cause of chronic cor puhnonale is chronic. obstructive pulmonary disease - Rubin's pathology