Lymph contains these special type of white blood cells which help in fighting infections.
lymphocytes
The correct option is (a).
Explanation of the correct option:
Explanation of the incorrect options:
Option B:
Thrombocytes help in the clotting of blood. They are also known as platelets.
Option C:
Erythrocytes help in supplying oxygen to the body. These are also known as red-blood cells.
Final answer: Lymph contains these special type of white blood cells known as lymphocytes which help in fighting infections.