Which of the following is NOT a type of pasta offered at Demos' Restaurant?

Lasagna is considered a type of pasta dish rather than a specific type of pasta itself. While it is made with sheets of pasta, it is generally classified as a baked pasta dish that is layered with ingredients like cheese, meat, sauce, and vegetables. The other options listed—fettucine, vermicelli, and spaghetti—are all distinct types of pasta, each with its own shape and preparation method. Therefore, recognizing lasagna as a dish rather than a type of pasta is what makes it the correct answer in this context.