This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'A client is recently diagnosed with HIV and a highly antiretroviral therapy is started. After the first week of therapy, the patient complains of headache, dizziness, and nightmares. Which one of the following anti-retroviral drugs is most likely associated with these symptoms? \nSelect and explain. \nA. Lamivudine., B. Efavirenz., C. Tenofovir., D. Saquinavir.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Efavirenz\xa0is a non-nucleoside reverse transcriptase inhibitor. Side effects include rash, dizziness, confusion, headache, and nightmares.\n\nOptions A and C: Lamivudine and Tenofovir\xa0side effects includes headache, dizziness, nausea, diarrhea, or trouble sleeping.\nOption D: Saquinavir can cause headache, nausea, diarrhea, and photosensitivity.', 'role': 'assistant'}]