| I: | PCR is now used routinely to detect HIV in suspected AIDS patients. |
| II: | PCR is being used to detect mutations in genes in suspected cancer patients. |
| III: | PCR can detect infections only when symptoms are present. |
| 1. | Statement I is correct, Statement II is incorrect, Statement III is correct. |
| 2. | Statement I is incorrect, Statement II is correct, Statement III is correct. |
| 3. | Statement I is correct, Statement II is correct, Statement III is incorrect. |
| 4. | Statement I is incorrect, Statement II is incorrect, Statement III is correct. |