Which requirement ensures that participants give informed consent to participate in research?

• A. Anonymity of participants
• B. IRB approval of the study protocol
• C. Informed Voluntary Consent
• D. No risk required

Answer: (C)

Informed consent is the process that ensures participants understand what the study involves, including procedures, risks, benefits, and their rights, and that they agree to participate voluntarily. The best answer directly embodies this idea by emphasizing that participation requires informed, voluntary agreement given by a person who understands what will happen. This reflects the core ethical principle of respect for autonomy: individuals must have the information and freedom to decide for themselves.

Why the other options don’t fit as the requirement for informed consent: anonymity protects privacy but doesn’t guarantee that someone understands the study or freely agrees to participate. IRB approval helps ensure the study design protects participants and meets ethical standards, but it does not substitute for each participant’s own consent. No risk required is incorrect because research can involve some level of risk, and even minimal-risk studies still require informed voluntary consent. Additionally, informed consent is often an ongoing process, not a one-time form, and participants should be able to withdraw at any time.