Kaziranga National Park, situated in Assam, is famous for

Concept: Every major national park of India is popularly identified in general-knowledge convention by its flagship or signature species — the specific animal whose conservation status gives the park its global recognition — which is distinct from any other fauna merely present inside the park.

Application: Kaziranga National Park, on the south bank of the Brahmaputra in Assam, is a UNESCO World Heritage Site declared specifically because it holds the largest population of the Indian one-horned rhinoceros (Rhinoceros unicornis) in the world — over two-thirds of the global wild population lives here. This flagship-species status is why Kaziranga is famous for the one-horned rhinoceros in exam and general-knowledge convention.

Cross-check — contrast with each other option by value:

• Spotted Deer is present in Kaziranga as prey/herbivore fauna, but the species is common and widely distributed across numerous Indian parks, so it does not define Kaziranga’s distinct global identity.

• Leopard also occurs within Kaziranga’s habitat, but leopards are found across most forested regions of India and are not the species associated with Kaziranga’s UNESCO recognition.

• Elephant populations do live in Kaziranga, but Assam and India host several major elephant reserves, so the elephant is not the flagship species unique to Kaziranga the way the rhinoceros is.

Result: By the park’s defining conservation identity and by elimination of the other options, Kaziranga National Park is famous for the One-horned Rhinoceros.