Which of the following is NOT typically listed as a vulnerable population in research ethics?

• A. Adults with full decision-making capacity
• B. Minors under 18
• C. Pregnant women
• D. Non-English-speaking subjects

Answer: (A)

In research ethics, vulnerability refers to groups that may have limited ability to protect their own interests or to give fully informed consent. Minors under 18 are recognized as vulnerable because they cannot legally contract and require parental permission and additional protections. Pregnant women are considered vulnerable due to potential risks to the fetus and historical concerns about coercion or exploitation. Non-English-speaking subjects are seen as vulnerable because language barriers can hinder true understanding of the study and the consent process.

Adults with full decision-making capacity are not typically listed as a vulnerable population because they can understand the information presented, weigh risks and benefits, and provide voluntary consent without the same heightened protections. They still deserve clear information and voluntary participation, but they don’t require the extra safeguards reserved for vulnerable groups.