<prompt> A 28 year old woman was admitted electively to a HDU following C- section. A diagnosis of fatty liver of pregnancy had been made preoperatively. She was commenced on a continuous morphine infusion at 5 mghr and received oxygen by mask. This was continued overnight and she was noted to be quite drowsy the next day. Aerial blood gases were- pH 7.16, pCO2- 61.9 mmHg, pO2- 115 mmHg and HCO3- 21.2 mmoll?Respiratory acidosis Metabolic acidosisRespiratory alkalosis Metabolic alkalosisRespiratory acidosis Metabolic alkalosisRespiratory alkalosis Metabolic acidosis  <response>: Acidotic pH, Elevated CO2 , Low HCO3 Respiratory acidosis Metabolic acidosis 