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': 'A QRS duration between 100 and 120 milliseconds suggests all of the following, Except: \nSelect and explain. \nA. Normal, B. Left anterior Fascicular Block, C. Left posterior Fascicular Block, D. Left Bundle Branch Block', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is D (Left Bundle Branch Block) Left Bundle Branch block is typically associated with a QRS duration greater than 120 milli seconds. Paial Blocks (Fascicular or hemiblocks) in the left bundle system (left anterior or posterior fascicular blocks) generally do not prolong the QRS duration substantially and QRS duration typically remains less than 120 milliseconds.', 'role': 'assistant'}]