Final answer:
According to Good Clinical Practice (GCP), the master randomization list should be kept in both the investigator's and sponsor's files. This ensures transparency and accountability in clinical trials.
Step-by-step explanation:
According to Good Clinical Practice (GCP), the master randomization list should be kept in both the investigator's and sponsor's files. GCP is a set of international quality standards for designing, conducting, recording, and reporting clinical trials involving human subjects. The master randomization list is a critical component in the randomization process, ensuring that treatment assignments are randomly allocated to participants in a clinical trial. By keeping the master randomization list in both the investigator's and sponsor's files, it ensures transparency and accountability in the trial.