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 cause of RBBB 
Select and explain. 
A. It can occur in a normal person, B. Pulmonary embolism, C. Corpulmonale, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. is 'd' i.e., All of the above Causes of RBBB Normal physiological Pulmonary embolism/corpulmonale Pulmonary aery hypeension ASD Rheumatic hea disease