What is the main protein in the "Fish 'n' Chips"?

The main protein typically used in "Fish 'n' Chips" is cod. This classic dish, which originated in the United Kingdom, features deep-fried fish served alongside crispy chips (fries). Cod is favored for its mild flavor and flaky texture, making it an ideal choice for frying. It has a firm yet tender flesh that holds up well during the cooking process, enhances the overall taste of the dish, and is often the traditional fish used in many recipes. While other types of fish, like sole and halibut, can also be used in variations of the dish, cod remains the most commonly recognized and traditional protein for this iconic meal, making it the correct answer.