<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:Recently, clarithromycin was found to have an increased risk of cardiac death in a Danish study. This study analyzed patients who were previously treated with clarithromycin or another antibiotic, and then they were followed over time to ascertain if cardiac death resulted. What type of study design does this represent?? A: Randomized controlled trial, B: Cohort study, C: Cross-sectional study, D: Case control study, E: Non-inferiority trial,  <response>: This question is asking about the type of study design used in a research study that looked at the risk of cardiac death in patients who took clarithromycin versus another antibiotic. It describes a study where patients were divided into groups based on their prior antibiotic exposure clarithromycin vs other antibiotic and then followed over time to see who developed the outcome of interest cardiac death. This type of study where subjects are identified based on their exposure status and then followed forward in time to ascertain outcomes is called a cohort study. The other options do not accurately reflect the study design described.B: Cohort study 