The correct answer is Krishnagiri.
Krishnagiri is a district in the Indian state of Tamil Nadu. It is located in the northern part of the state and is bordered by the districts of Dharmapuri, Vellore, Tiruvannamalai, Salem, and Erode. The district has a population of over 2.5 million people and is the 12th most populous district in Tamil Nadu.
The district is known for its jackfruit cultivation. Jackfruit is a large, fleshy fruit that is native to Southeast Asia. It is the largest tree-borne fruit in the world and can weigh up to 80 kilograms. Jackfruit is a good source of vitamins and minerals, including vitamin C, potassium, and magnesium. It is also a good source of dietary fiber.
The district has a number of jackfruit farms and processing units. The jackfruit produced in the district is exported to other parts of India and to other countries.
The other options are incorrect because they are not districts in Tamil Nadu. Panruti is a town in the Cuddalore district of Tamil Nadu. Dharmapuri is a district in the northern part of Tamil Nadu. Theni is a district in the western part of Tamil Nadu.