frustration boiling over at a confirmation for florida's top doctor after refusing to answer simple questions about covid vaccines. >> the question is a scientific one and one that is answered with data. just a yes or no, do vaccines work? . >> as a scientist, you know, i -- i -- i'm compelled to answer the scientific question. >> scientifically, do vaccines, do the vaccines work? >> yes or no questions are not thought easy to find in science. so i will -- i understand -- i think i have better clarity about your question at this point. so what i would say is the most commonly used vaccines in the united states, which would be the pfizer product and the