When a patient’s immune system becomes reactive to a drug, this is an example of?

✅ A. rickets

✅ A. Convex

✅ A. Heliograph

✅ B. 4.5 to 6.2 million

✅ A. White blood cells

✅ C. Sea water

✅ C. Cancer

✅ A. 20 to 30