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
Which of the following is the cause of RBBB? 
Select and explain. 
A. It can occur in a normal person, B. Pulmonary embolism, C. Cor pulmonale, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Causes of RBBB 

Normal physiological
Pulmonary embolism/corpulmonale
Pulmonary artery hypertension
ASD
Rheumac heart disease