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': 'On in E.C.G tracing, the presence of right atrial hyperophy is suggested by - \nSelect and explain. \nA. Tall spiky P wave, B. Widened P wave, C. Prolonged P-R interval, D. Increased P-Q segment', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Right atrial enlargement produces a peaked P wave (P pulmonale) with amplitude: > 2.5 mm in the inferior leads (II, III and AVF) > 1.5 mm in V1 and V2 Ref : Harrison 20th edition pg 1583', 'role': 'assistant'}]