Which of the following is NOT a responsibility of the investigator?

The responsibility of the investigator primarily involves ensuring the integrity and ethical conduct of the clinical trial, as well as prioritizing the safety and rights of the participants. Ensuring participant safety is a core responsibility, as investigators must monitor health outcomes and address any concerns that arise during the study. Reporting adverse events is also essential, as timely and accurate reporting helps maintain participant safety and ensures compliance with regulatory requirements.

Collecting and analyzing data are fundamental duties of the investigator because they play a crucial role in assessing the efficacy and safety of the trial intervention. It is necessary for investigators to accurately gather and interpret this information to draw meaningful conclusions about the study objectives.

In contrast, marketing the clinical trial is not the responsibility of the investigator. This function typically falls to the study sponsor or a designated marketing team, which focuses on promoting the trial to attract potential participants rather than ensuring compliance, ethical standards, and scientific rigor, which are central to an investigator's role. Therefore, this choice distinctly does not align with the core responsibilities outlined for investigators in the context of clinical trials.