Rhinoceros (Rhinoceros unicornis) is an endangered animal and conserved in Kaziranga National Park. Therefore, option A is a correct match.
Great Indian Bustard Sanctuary is a wildlife sanctuary for the great Indian bustard at Solapur, Maharashtra, India. Therefore, option B is an incorrect match.Lion is protected in Gir National park which is a forest and wildlife sanctuary, India. Therefore, option B is an incorrect match.
Indian Wild Ass Sanctuary also known as the Wild Ass Wildlife Sanctuary is located in the Little Rann of Kutch in the Gujarat state of India. Therefore, option D is an incorrect match.
Therefore, the correct answer is option A.