The question asks for the largest white blood corpuscle, and the correct answer is option 2, Monocyte.

To understand this, let`s briefly explain what each option represents.

1. Lymphocyte: Lymphocytes are a type of white blood cell that plays a crucial role in the immune system. They are responsible for producing antibodies and coordinating immune responses. However, lymphocytes are relatively small in size compared to other types of white blood cells.

2. Monocyte: Monocytes are another type of white blood cell. They are larger than lymphocytes and have a kidney-shaped nucleus. Monocytes are known for their phagocytic abilities, meaning they can engulf and digest foreign particles, pathogens, and cellular debris.

3. Thrombocyte: Thrombocytes are not white blood cells but rather platelets involved in blood clotting. They are much smaller in size compared to white blood cells.

4. Erythrocyte: Erythrocytes, also known as red blood cells, are responsible for carrying oxygen to tissues and removing carbon dioxide from the body. They are also not white blood cells and are much smaller in size.

Therefore, option 2, Monocyte, is the largest white blood corpuscle among the options given