Thermometer : Temperature :: Glucometer : ?

Answer: Option D

This question gives you the pair "Thermometer : Temperature". Think about what a thermometer does: it measures temperature.

We need to find a similar pair. A glucometer is a device used to measure something related to the body.

Let's look at the options:

Option A: Body sugar - A glucometer doesn't measure all body sugar, it measures a specific type.
Option B: Body resistance - This is incorrect; a glucometer doesn't measure resistance.
Option C: Blood - A glucometer uses blood but doesn't measure the overall amount of blood.
Option D: Blood sugar - This is correct! A glucometer measures blood sugar levels, just like a thermometer measures temperature.

Therefore, the best answer is Option D: Blood sugar because it shows the same relationship as "Thermometer : Temperature".