Final answer:
Legal guardians, healthcare proxies, parents of minors, and mentally competent individuals can grant consent for another person.
Step-by-step explanation:
When it comes to granting consent for another person, several categories of individuals can do so. These include legal guardians, healthcare proxies, parents of minors, and mentally competent individuals.
Legal guardians are individuals who have been appointed by a court to make decisions on behalf of another person, typically a minor or someone who is incapacitated.
Healthcare proxies are specific individuals who have been designated by someone to make medical decisions for them if they are unable to do so due to incapacitation.
Parents of minors can provide consent on behalf of their children, as children are not considered competent to provide consent for themselves.
Mentally competent individuals have the ability to make decisions for themselves and can grant consent for another person if they choose to do so.