The limitation of a clinical trial is not the "Number of test tubes" (OA) or the "Amount of peer review" (OB). These options are not typically considered limitations of a clinical trial.
The limitation of a clinical trial can be related to the "Amount of random assignment" (OC). Random assignment is a critical aspect of a well-designed clinical trial to ensure that participants are assigned to different groups in a random and unbiased manner. Limitations can arise if there are challenges in implementing random assignment effectively, such as difficulties in ensuring a truly random selection process or limitations in the number of participants available for the study.
Another limitation of a clinical trial can be associated with "Hospital costs" (OD). Conducting a clinical trial can be expensive, especially when considering the costs related to recruiting participants, conducting tests, providing medical care, and managing the trial overall. High hospital costs can limit the feasibility and scale of a clinical trial, impacting the ability to gather sufficient data or reach statistically significant results.
In summary, the limitations of a clinical trial can involve challenges with random assignment and high hospital costs, which can affect the validity, reliability, and practicality of the study.
