Which shake uses chocolate syrup as part of its ingredients?

The chocolate shake uses chocolate syrup as a key ingredient, which is essential for giving it the rich chocolate flavor that distinguishes it from other shakes. This shake is made by blending ice cream with chocolate syrup, resulting in a creamy, indulgent beverage that highlights the taste of chocolate.

In contrast, the vanilla shake primarily consists of vanilla ice cream and does not incorporate chocolate syrup, while the strawberry shake uses strawberry flavoring or puree instead. The Oreo shake contains crushed Oreo cookies, which adds flavor but does not rely on chocolate syrup alone. Therefore, the chocolate shake is the only option that specifically includes chocolate syrup in its ingredients.