Which soup is known for containing clams as a primary ingredient?

Clam Chowder is a type of soup where clams are a primary ingredient, which distinguishes it from the other options provided. This creamy soup often includes potatoes, onions, and celery, along with milk or cream, contributing to its rich and hearty texture. Clam Chowder is particularly popular in regions where seafood is abundant, such as New England, and is well-known for its distinctive flavor profile that highlights the brininess of the clams.

In contrast, the other soups listed do not feature clams as a significant or defining ingredient. Tomato Bisque primarily consists of tomatoes and cream, Chili is made with various types of meat and beans, and Broccoli Cheddar focuses on broccoli and cheese as its main components. These differences in primary ingredients clearly identify Clam Chowder as the soup that is uniquely characterized by the presence of clams.