Which city is called "Oyster city"?

Correct option is D

Chennai, the capital city of Tamil Nadu, is often referred to as the "Oyster City" due to its historical association with the pearl and oyster industry. The city was a significant center for the collection and trade of oysters and pearls, especially in earlier times, which led to it earning this nickname. Chennai has a long coastal history, with its proximity to the Bay of Bengal providing a rich environment for marine life, including oysters.

The city's name itself is derived from the Tamil word "Chennapattanam," and its connection to the sea and marine products further strengthens its association with the term "Oyster City."