In which of the following are hydrogels used? Controlled drug delivery in patients

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:

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

Correct Answer: (d) 1, 2 and 3

Explanation:

• Hydrogels are used in controlled drug delivery systems due to their ability to absorb and release drugs in a controlled manner.
• Hydrogels can be used in mobile air-conditioning systems as desiccants to control humidity.
• Hydrogels are also used in the preparation of industrial lubricants due to their water retention properties and ability to reduce friction.
  Possible Sources: Material science and biomedical engineering references.