Final answer:
The true statement is 'C. RBC contain carbonic anhydrase'. Red blood cells have the enzyme carbonic anhydrase, which is crucial for CO2 transport in the blood. The other statements are incorrect; blood group O individuals have both anti-A and anti-B antibodies, eosinophils fight parasitic infections, and the T-wave on an ECG represents ventricular repolarization.
Step-by-step explanation:
The correct statement among the options provided is C. RBC contains carbonic anhydrase. This is true because red blood cells (RBC) contain an enzyme called carbonic anhydrase, which catalyzes the conversion of carbon dioxide and water to carbonic acid. This process is important for the transportation of carbon dioxide in the blood from the tissues to the lungs, where it is exhaled.
A person with blood group O has neither antigen A nor antigen B on their erythrocytes but has both anti-A and anti-B antibodies in their blood plasma. Eosinophils are a type of white blood cell that is typically associated with combating parasitic infections and allergic reactions rather than bacterial infections. The T-wave on an ECG represents the repolarization of the ventricles, not the depolarization.