The correct answer is: a) Namakkal and Erode.
The poultry industry in Tamil Nadu is concentrated around the cities of Namakkal and Erode. These cities are located in the central part of the state, and they are well-connected to other major cities in Tamil Nadu. The climate in these cities is ideal for poultry farming, and there is a good availability of feed and water. The government of Tamil Nadu has also provided a number of incentives to poultry farmers, which has helped to boost the industry.
Madurai and Coimbatore are also major cities in Tamil Nadu, but they are not as important for the poultry industry as Namakkal and Erode. Chennai and Tiruchirappalli are located on the coast, and the climate is not as ideal for poultry farming. Salem and Vellore are located in the northern part of the state, and they are not as well-connected to other major cities in Tamil Nadu.
In conclusion, the poultry industry in Tamil Nadu is concentrated around the cities of Namakkal and Erode. These cities are located in the central part of the state, and they are well-connected to other major cities in Tamil Nadu. The climate in these cities is ideal for poultry farming, and there is a good availability of feed and water. The government of Tamil Nadu has also provided a number of incentives to poultry farmers, which has helped to boost the industry.