Which of the following is a type of pre-cooked breakfast meat?

Sausage is a type of pre-cooked breakfast meat because it often undergoes a cooking process during its production, making it ready to eat after minimal reheating. Many varieties of sausage are available, ranging from breakfast links to patties, and they are commonly found in breakfast dishes. The pre-cooking process is designed to enhance flavor, make it safe to eat, and extend shelf life.

While turkey can be used in breakfast dishes, it does not inherently refer to a pre-cooked format in the same way that sausage is prepared and marketed. Fish can also be part of breakfast but is less commonly associated with pre-cooked breakfast meats, and lamb is generally not a typical breakfast meat. Therefore, sausage stands out as the most relevant answer in the context of pre-cooked breakfast meats.