In what type of agency does a person or court give an agent full control over someone's life and belongings to meet a specific need

A universal agency.

Explanation:

A universal agenct, in real estate, can be defined as a person who is given full authority of a principal. A universal agent replica the authorities of a principal, as much as that he/she can sign a legal document, make a deal of property, or even sell a property.

In simple terms, all the acts and authoritiies are vested to an universal agent of his/her principal. A universal agent is appointed by a power of attorney giving full control over the principal's property, belongings, and life to meet a specific need. It is also important to note that a principal can have only one universal agent.

Therefore, a universal agency is the correct answer.