Which of the following components must be disclosed for informed consent to be valid?

• A. Disclosures of the procedure, risks/benefits, and alternatives only
• B. Assessment of understanding/voluntariness only
• C. Disclosures of the procedure, risks/benefits, alternatives, and assessment of understanding/voluntariness
• D. Disclosure of the procedure and risks/benefits only

Answer: (C)

Validity of informed consent hinges on four elements: clear disclosure of the procedure itself, the risks and benefits, reasonable alternatives (including the option of no treatment), and an assessment that the patient understands the information and is acting voluntarily. The best choice includes all four elements, ensuring the patient can make a truly informed and voluntary decision. Merely providing some information without confirming understanding or without addressing voluntariness leaves room for misunderstanding or coercion, and omitting alternatives or the assessment of understanding undermines autonomy. The other options fail because they miss at least one essential component.