| a. | Intravenous drug abusers are at a high risk of acquiring HIV infection. | 
| b. | Chemical carcinogens like UV rays and X-rays cause neoplastic transformation. | 
| c. | Cancer is the most dreaded infections disease in humans. | 
| d. | Drug used in chemotherapy besides targeting cancer cells, also inhibit the proliferation of normal cells in the body leading to hair loss and anaemia. | 
| Assertion (A): | Early detection of cancer increases the likelihood of successful treatment. | 
| Reason (R): | Techniques like MRI and CT scans are effective in detecting cancers at an early stage. | 
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). | 
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). | 
| 3. | (A) is True but (R) is False. | 
| 4. | (A) is False but (R) is True. |