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': 'In hyperkalamia -a)  Serum level >5.5 meq/Lb) Serumlevel> 6.5 meq/Lc) T. wave inversiond) Peaking of T. wavee) Venticular fibrillation \nSelect and explain. \nA. acd, B. ade, C. abd, D. ad', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Electrocardiographic manifestations of hvperkalemia :\n\nECG changes often do not correlateQ with the degree of hyperkalemia\n\nE.C.G changes suggestive of an effect of hyperkalemia on cardiac conduction include :\n\nPeaked T waves (tall tented T waves)Q\n\t- Prolongation of the PR intervalQ\nWidening of the QRSQ\n\t- Loss of the P waveQ\nSine wave patternQ\nSinus arrestQ\nIn patients with organic heart disease and abnormal baseline ECG, bradycardia may be the only new ECG abnormality.\nHyperkalemia may ultimately lead to cardiac arrest (asystole) or Ventricular fibrillation\nHyper kalemia is defined as serum potassium > 5 meq/L.', 'role': 'assistant'}]