Explanation:

- Option 1: IISC

The Indian Institute of Science (IISC) is mainly focused on advanced scientific and technological research, not known for granting large numbers of patents to industries.

- Option 2: BHEL

Bharat Heavy Electricals Limited (BHEL) is an engineering and manufacturing company and unlikely to grant free patents as it is a commercial entity.

- Option 3: BEL

Bharat Electronics Limited (BEL) specializes in electronics for defense and telecommunications but is not recognized for offering free patent access to industries extensively.

- Option 4: NAL

The National Aerospace Laboratories (NAL) performs aerospace-related research, but similar to above, not known widely for offering free patents.

- Option 5: DRDO

The Defence Research and Development Organisation (DRDO) focuses on military technology and has indeed granted free access to 450 patents to the Indian industry recently.

Correct Answer