The correct answer is: a) Textile and knitwear production.
Coimbatore and Tiruppur are two cities in the Indian state of Tamil Nadu. They are both globally renowned centers for textile and knitwear production. Coimbatore is known for its production of cotton yarn, while Tiruppur is known for its production of cotton fabrics. Both cities have a long history of textile production, and they are home to a large number of textile mills and factories. The textile industry is a major contributor to the economy of both Coimbatore and Tiruppur.
Option b) is incorrect because Coimbatore and Tiruppur are not globally renowned centers for heavy machinery manufacturing. The heavy machinery manufacturing industry is concentrated in other parts of India, such as Gujarat and Maharashtra.
Option c) is incorrect because Coimbatore and Tiruppur are not globally renowned centers for chemical and fertilizer industries. The chemical and fertilizer industries are concentrated in other parts of India, such as Gujarat and Andhra Pradesh.
Option d) is incorrect because Coimbatore and Tiruppur are not globally renowned centers for pharmaceutical production. The pharmaceutical industry is concentrated in other parts of India, such as Maharashtra and Karnataka.