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
[{'content': "Alternating RBBB with Left anterior hemiblock is seen in \nSelect and explain. \nA. 1' degree hea block, B. Complete hea block, C. Mobitz type II block, D. Bi-fascicular block", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Bi-fascicular block Bifascicular block - combination of RBBB with either left anterior hemiblock or left posterior hemiblock. Tri fascicular block - RBBB plus either LAHB/LPHB+ first degree AV block. Complete hea block destruction of - AV node leading to AV dissociation", 'role': 'assistant'}]