The correct answer is D. Nalgonda.
Nalgonda is a district in the Indian state of Telangana. It is located in the central part of the state and is bordered by the districts of Warangal to the north, Khammam to the east, Ranga Reddy to the south, and Hyderabad to the west. The district has a population of over 3.5 million people and is the third most populous district in Telangana.
Nalgonda is famous for its Narayanpet cotton sarees with silk borders. These sarees are known for their fine quality and intricate designs. They are made from a special type of cotton that is grown in the district. The sarees are hand-woven and embroidered with silk thread. They are usually worn by women on special occasions.
The other options are incorrect. Warangal is famous for its fort and temples. Karimnagar is famous for its rice fields and mangoes. Mahbubnagar is famous for its granite mines.