This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arrhythmias, Subject name: Medicine
Which of the follow ing 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 4d' i.e.. All of the above Causes of RBBBNormal physiologicalPulmonary embolism/corpulmonalePulmonary artery hypertensionASDRheumatic heart disease