This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diabetes Mellitus, Subject name: Medicine
All are true about diabetic ketoacidosis except? 
Select and explain. 
A. Raging thirst, B. It is an early presentation in type 1 DM, C. Sodium Nitroprusside test is done to detect ketones, D. Serum bicarbonate > 15 mmol/L
D: Serum bicarbonate > 15 mmol/L
Answer: D: Serum bicarbonate > 15 mmol/L 
Explanation: In diabetic ketoacidosis, the elevated blood sugar due to osmotic diuresis leads to polyuria. The stimulation of osmo-receptors will lead to increased thirst. DKA can lead to early presentation of type 1 DM but more frequently occurs in patients with pre-existing diabetes. Serum ketones are present in DKA and detectable at dilutions of 1:8. Urine dipstick using sodium nitroprusside can help in detection but plasma beta hydroxybutyrate is preferred. Serum bicarbonate levels in DKA are <10mmol/L