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

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