During trial reviews, special attention should be paid to trials that may include...

• A. Trials with no risk.
• B. Trials that may include vulnerable subjects.
• C. Trials with only adult subjects.
• D. Trials with no need for consent.

Answer: (B)

The main issue here is recognizing that some trial participants need extra protections because they may be more vulnerable to coercion, misunderstanding, or exploitation. When reviewing trials, you pay special attention to studies that may include individuals who cannot fully protect their own interests—such as children, people with diminished decision-making capacity, or other groups at heightened risk. These trials require heightened safeguards to protect rights, safety, and well-being, including appropriate consent processes (and assent where applicable), involvement of legally authorized representatives when needed, careful risk–benefit assessment, and additional oversight.

This is why the best choice is the one describing trials that may include vulnerable subjects—the emphasis is on applying extra protections where vulnerability exists. The other options don’t fit because not every trial with low or no risk eliminates the need for safeguards, adult-only status doesn’t guarantee absence of vulnerability, and consent is a fundamental requirement in GCP—there isn’t a scenario where a trial would legitimately have no need for consent.