Nepali is an Indo-Aryan language. It is the official language and de facto lingua franca of Nepal and is also spoken by some Bhutanese and Burmese people. In India, Nepali is listed in the Eighth Schedule to the Constitution of India. It has official status in the Indian state of Sikkim and in West Bengal's Darjeeling district. Nepali developed in proximity to a number of Indo-Aryan languages, most notably the Pahari languages and Magahi, and shows Sanskrit influences. However, owing to Nepal's geographical area, it has also been influenced by Tibeto-Burman languages. Nepali is mainly differentiated from Central Pahari, both in grammar and vocabulary, by Tibeto-Burman idioms owing to close contact with the respective language group. Nepali language shares 40% lexical similarity with the Bengali language. British Resident at Kathmandu Brian Houghton Hodgson has observed that it is, in eight-tenths of its vocables, substantially Hindi.