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?

In most cases, ketonemia is due to increased production of ketone bodies by the liver rather than to a deficiency in their utilization by extrahepatic tissues. While acetoacetate 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. A clear understanding of the biochemical basis and pathophysiology of DKA is essential for its efficient treatment. The cardinal biochemical features are: Hyperketonaemia (≥  3.0 mmol/L) or ketonuria (more than 2+ on standard urine sticks) Hyperglycaemia (blood glucose  ≥ 11 mmol/L, (approximately 200 mg/dL)) Metabolic acidosis (venous bicarbonate < 15 mmol/L and/or venous pH < 7.3 (H+ > 50 nmol/L)). Reference: HARPERS ILLUSTRATED BIOCHEMISTRY30th ed Page no 231; Davidson, page no 735