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': 'N terminal pro-brain natriuretic peptide levels are elevated in: \nSelect and explain. \nA. Atrial fibrillation, B. Left heart failure, C. Pulmonary thromboembolism, D. Myocardial infarction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In left heart failure, left ventricle releases N terminal pro-BNP and it is used as a marker for left ventricular failure.\nMeasurement of brain natriuretic peptide levels in serum is increasingly used to assess for CHF in patients presenting with\xa0acute\xa0dyspnea,\xa0but\xa0may be\xa0elevated in the presence of right ventricular strain as well.\nPlasma levels of N-terminal pro brain natriuretic peptide moderately correlate with carcinoid heart disease severity.\nReference: Harrison’s P R I N C I P L E S\xa0 \xa0O F I N T E R N A L M E D I C I N E 20th edition page no 1740,', 'role': 'assistant'}]