Which ingredient distinguishes the Mediterranean Salad from others?

The ingredient that distinguishes the Mediterranean Salad from others is Kalamata olives. These olives are a hallmark of Mediterranean cuisine, known for their rich and briny flavor, which adds a unique and authentic taste to the salad. They provide not only a distinctive taste but also contribute to the overall texture and visual appeal of the dish, often complemented by other Mediterranean ingredients such as feta cheese, cucumbers, and tomatoes. Unlike the other options, which might be used in various types of salads but don't specifically tie to Mediterranean flavors, Kalamata olives specifically evoke the culinary heritage of the Mediterranean region, making them essential for this particular salad.