The blood glucose level is commonly expressed as

1. A

   MM of Hg

   Millimetres of mercury (mm Hg) is the usual unit of blood pressure, not of blood glucose.

2. B

   Milligram per decilitre

   Blood glucose is commonly expressed as milligrams per decilitre (mg/dL) in clinical practice in India. That is the official key.

3. C

   Parts per million

   Parts per million is used for trace pollutants or some water-quality measures, not routine blood sugar.

4. D

   Gram per litre

   Grams per litre would be a thousand times coarser than mg/dL and is not the common clinical expression.

Summary. Official key is (b) milligram per decilitre. Fasting and post-prandial ranges in Indian clinics are quoted in mg/dL (mmol/L is the SI alternative). mm Hg is pressure; ppm is concentration of traces; g/L is not the ward unit. Honour the stored letter (b).