Who should sign an informed consent form for minor children?

The correct choice is a legal guardian or parent because they are typically the individuals who hold the legal authority to make medical and dental decisions on behalf of a minor child. Informed consent requires that a responsible adult who has the legal capacity to make decisions and understand potential risks and benefits provides consent for treatment. This is crucial to ensure that the rights and welfare of the child are protected, as minors are not considered to have the legal capacity to provide informed consent on their own.

Other options, such as any family member, a teacher, or a school administrator, do not hold the necessary legal authority to sign consent forms for medical procedures. Only parents or legal guardians have the legal standing to make such decisions regarding a minor's healthcare. The involvement of any other individual might not be compliant with legal standards or could lead to ethical concerns regarding the child's care.