Single horned rhinoceros are found in which of the following?

The correct option is Kaziranga National Park.

Detailed Explanation:
The great Indian single-horned rhinoceros (Rhinoceros unicornis) is primarily found in the northeastern region of India and Nepal. Kaziranga National Park, located in the state of Assam, India, is world-renowned for conserving this species. It holds the distinction of sheltering the world's largest population of the great Indian one-horned rhinoceros, containing approximately two-thirds of their global population.

Let's look at the other options for comparison:
- Indira Gandhi Zoological Park: Located in Visakhapatnam, Andhra Pradesh, this is a zoo and not the natural national park habitat famous for wild rhino conservation.
- Nehru Zoological Park: Located in Hyderabad, Telangana, this is a zoo rather than a natural wildlife sanctuary for wild single-horned rhinos.
- Gir National Park: Located in Gujarat, this park is famous as the exclusive natural habitat of the endangered Asiatic lion, not the single-horned rhinoceros.