Which of the following is the most appropriate quality assurance measure to assess the competency of a staff pharmacist?

One way to assess the competency of a staff pharmacist is by documenting "catches" of near miss medication errors. This quality assurance measure shows that the pharmacist is alert and attentive, which is crucial for ensuring patient safety. Option A may not accurately reflect the pharmacist's competency as rapid turnaround time does not guarantee correct dispensing. Option C and D may not accurately assess the pharmacist's competency as it does not directly relate to their job responsibilities or skills as a pharmacist. Moreover, the absence of patient complaints or attending continuing education sessions does not necessarily indicate competency.