This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Vaccine undergoing phase 3 trial for HIV is \nSelect and explain. \nA. nVA, B. AIDS VAX, C. CTL strain, D. vDX', 'role': 'user'}, {'content': 'Answer: B \nExplanation: AIDSVAX is an experimental HIV vaccine that was developed originally at Genentech in San Francisco, California, and later tested by the VaxGen company, a Genentech offshoot. A repo published in the December 2009 New England Journal of Medicine on this Thailand clinical trial, also known as the RV144 trial, of the vaccine known as "ALVAC-AIDSVAX B/E" showed the combination treatment\'s efficacy ranging from 26.1 to 31.4%, which though far from optimal makes the combination AIDSVAX-Aventis vaccine one of the first impoant milestones in the world\'s struggle to produce a globally effective HIV vaccine. However, during the study seven paicipants were removed from the study when the results showed they had already been found with an HIV-1 infection at baseline, which changed the result from 26.1 to 31.4% vaccination efficacy. Ref: https://en.m.wikipedia.org/wiki/AIDSVAX', 'role': 'assistant'}]