This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Electrocardiography, Subject name: Medicine
[{'content': 'Low voltage in ECG indicates? \nSelect and explain. \nA. Pulmonary embolism, B. Cor pulmonale, C. Infective endocarditis, D. Pericardial effusion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ANSWER: (D) Pericardial effusionREF: Harrison 17th ed chapter 221Low voltage is indicative of conditions where the electrical signal from the heart is attenuated either because of a heart condition in itself or because of conditions outside the heart. Possible reasons Include:Pericardial effusionConstrictive pericarditisSevere Ischemic heart diseaseInfiltrative disease, e.g. amyloidosisHypothyroidismPulmonary emphysemaPleural effusionPneumothoraxGeneralized edema', 'role': 'assistant'}]