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': 'Osborne waves in ECG is seen in? \nSelect and explain. \nA. Hypothyroidism, B. Hypothermia, C. Hyponatremia, D. Hypocalcemia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Osborn waves are usually observed in people suffering from hypohthermia with a temperature of less than 32 C (90 F), though they may also occur in people with high blood levels of calcium , brain injury, vasopastic angina or ventricular fibrillation . in Hyponatremia,Hypocalcemia,Hypothyroidism Osborn waves are not observed Ref Harrison 20th edition pg 1456', 'role': 'assistant'}]