Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning.Câu hỏiDrugs are tested in patient volunteers to monitor adverse reactions to long-term use. A. Patient volunteers help test drugs to monitor their adverse reactions to long-term use. B. Patient volunteers are tested by drugs to monitor adverse reactions to long-term use. C. Volunteers test drugs for patients to monitor their adverse reactions to long-term use. D. Adverse reactions to long-term use are monitored after being tested in patient volunteers.