Final answer:
Informed consent is the process of informing a research participant about the purpose, risks, alternatives, and reasons to delay a procedure. All of this information is necessary for ensuring informed consent.
Step-by-step explanation:
Informed consent is the process of informing a research participant about what to expect during an experiment, any risks involved, and the implications of the research, and obtaining their consent to participate.
All of the following information must be given to the patient in order for them to have received informed consent, which includes: the purpose of the recommended procedures, an explanation of risks involved in the procedure, alternative treatments or procedures, and reasons to delay the procedure.
Therefore, the answer is: None. All of these pieces of information are necessary for ensuring informed consent.