Civil Services Examination · प्रश्न 36

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:

1. A1 only
2. B1 and 2 only
3. C2 and 3 only
4. D1, 2 and 3