Final answer:
CPK uses different types of lettuce such as romaine, iceberg, and baby greens, depending on the salad and seasonal availability.
Step-by-step explanation:
The student is inquiring about the types of lettuce used by California Pizza Kitchen (CPK), which is a casual dining restaurant chain known for its innovative pizzas and salads. CPK typically offers a variety of salads featuring different types of lettuce, which may include romaine, iceberg, and baby greens, among others.
The specific lettuce types can vary based on the salad options available on the CPK menu, which could be influenced by seasonal produce and regional availability.