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

1. (a) 1 only
2. (b) 1 and 2 only
3. (c) 2 and 3 only
4. (d) 1, 2 and 3

Correct 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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