A drug is to be delivered by a nebuliser. The size of a droplet for its humidification is :
**Core Concept**
The question is testing the understanding of the size of droplets required for effective humidification in a nebulizer. Nebulizers are used to deliver medications in a fine aerosol form, and the size of the droplets is critical for ensuring that the medication reaches the lungs effectively.
**Why the Correct Answer is Right**
The correct answer is 5 micrometers. This size of droplet is ideal for nebulization because it allows for efficient delivery of medication to the lungs while minimizing deposition in the upper airway. Droplets smaller than 5 micrometers can be exhaled without being deposited in the lungs, while larger droplets may not be able to reach the lungs at all. The 5-micrometer size is achieved through the use of a nebulizer compressor, which breaks up the medication into tiny droplets.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because droplets larger than 10 micrometers are not effective for nebulization and may not reach the lungs.
**Option B:** This option is incorrect because droplets smaller than 0.5 micrometers may be exhaled without being deposited in the lungs.
**Option C:** This option is incorrect because there is no standard size for droplets in nebulization, and the correct answer is 5 micrometers.
**Clinical Pearl / High-Yield Fact**
When using a nebulizer, it's essential to ensure that the medication is delivered in a fine aerosol form to avoid deposition in the upper airway and maximize delivery to the lungs.
**Correct Answer:** C. 5 micrometers