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In which of the following are hydrogels used? 1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants Select the correct answer using the code given below:

UPSC · 2024 · Environment
Question:
In which of the following are hydrogels used? 1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants Select the correct answer using the code given below:

Options

(a) 1 only
(b) 1 and 2 only
(c) 2 and 3 only
(d) 1, 2 and 3
Answer: (a) 1 only

Explanation:
Hydrogels are polymeric materials capable of holding large amounts of water and are primarily used in biomedical applications such as controlled drug delivery, wound dressings, and tissue engineering.

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