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: Pathology
[{'content': 'The "gp 120" in HIV helps in: \nSelect and explain. \nA. Virus attachment, B. Virus replication, C. Virus penetration, D. Virus dissemination', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Virus attachment', 'role': 'assistant'}]