Which instrument is used to clean the interior of test tubes with bristles?

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Multiple Choice

Which instrument is used to clean the interior of test tubes with bristles?

Explanation:
The idea here is a tool designed specifically to scrub the inside of narrow glassware. A test tube brush has bristles on a long handle that can reach into the interior and scrub the curved walls effectively. The other items serve different roles—holding or securing tubes or cleaning surfaces without the inside-brushing action—whereas only the bristled brush is built for cleaning the interior of test tubes. Using it with a suitable detergent and then rinsing ensures residues are removed.

The idea here is a tool designed specifically to scrub the inside of narrow glassware. A test tube brush has bristles on a long handle that can reach into the interior and scrub the curved walls effectively. The other items serve different roles—holding or securing tubes or cleaning surfaces without the inside-brushing action—whereas only the bristled brush is built for cleaning the interior of test tubes. Using it with a suitable detergent and then rinsing ensures residues are removed.

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