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: Biochemistry
[{'content': 'A male, 55 years old is brought to the clinic in unconscious condition. The patient is a Type 2 diabetic since 15 years. General examination reveals RBS levels 268 mg/dl. Blood and Urine samples confirm the presence of  ketone bodies. Which of the following substances found raised in this patient blood is volatilized by lungs? \nSelect and explain. \nA. β-hydroxybutyrate, B. Acetoacetate, C. Acetone, D. Glycerol 3- phosphate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In most cases, ketonemia is due to increased production of ketone bodies by the liver rather than to a deficiency in their\xa0utilization\xa0by\xa0extrahepatic\xa0tissues.\xa0While\xa0acetoacetate and d(−)-3-hydroxybutyrate are readily oxidized by extrahepatic tissues, acetone is difficult to oxidize in vivo and to a large extent is volatilized in the lungs.\nA clear understanding of the biochemical basis and pathophysiology of DKA is essential for its efﬁcient treatment.\nThe cardinal biochemical features are:\n\nHyperketonaemia (≥\xa0 3.0 mmol/L) or ketonuria (more than 2+\xa0on standard urine sticks)\nHyperglycaemia (blood glucose\xa0 ≥\xa011 mmol/L, (approximately 200 mg/dL))\nMetabolic acidosis (venous bicarbonate\xa0<\xa015 mmol/L and/or venous pH\xa0<\xa07.3 (H+\xa0>\xa050 nmol/L)).\n\nReference: HARPERS ILLUSTRATED BIOCHEMISTRY30th ed Page no 231; Davidson, page no 735', 'role': 'assistant'}]