This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Reverse splitting of 2nd hea sound heard in - \nSelect and explain. \nA. RBBB, B. LBBB, C. Tricuspid stenosis, D. AR', 'role': 'user'}, {'content': "Answer: B \nExplanation: In LBBB, Left ventricular depolarisation is late than RV depolarisation, so A2 appeares late than P2. Causes of Reverse splitting : RV pacemaker WPW syndrome Eisen menkers syndrome AS LVF LBBB Ref : Harrison's 20th edition pg 1448", 'role': 'assistant'}]