In July 2019, researchers discovered Dracaena cambodiana, India's first dragon blood-oozing tree in:

The correct answer is Assam. Key Points Researchers discover Dracaena cambodiana, a dragon tree species in the Dongka Sarpo area of West Karbi Anglong district in Assam. This is for the first time that a dragon tree species has been reported from India. Dragon tree species whose sap turns bright red after coming in contact with air. This plant yields a dragon’s blood- a bright red resin. Sap of the plant species turns bright red after coming in contact with air. It is an important medicinal plant as well as an ornamental tree. The plant resin is used since ancient times as medicine, varnish, body oil, incense and dye.