Consider the following qualitative data summary (a summary of codes) and decide which suggested theme is most appropriate. In a study of Native Americans, indepth interviews were conducted to determine the reasons they may or may not receive vaccinations. Sixteen codes were initially identified, with five of these being retained for the final analysis. These are shown below. 1.notneeded 2. distrust contents 3. worry about side effects 4. lack of understanding 5. misinformation Possible theme (select the best one): a. safety concerns b. medical mistrust c. lack of knowledge