<prompt> The most common cause of acute cor pulmonale is:Pneumonia.Pulmonary thromboembolism.Chronic obstructive pulmonary diseasePrimary spontaneous pneumothorax  <response>: Answer is B Pulmonary thromboembolism: Most common causes of acute cor pulmonale is Pulmonary thromboembolism Most common cause of chronic cor pulmonale is Severe COPD 