Select the option that can be used as a one-word substitute for the given group of words.

A place in a large institution, for the care of those who are ill

Infirmary

The option that can be used as a one-word substitute for "a place in a large institution, for the care of those who are ill" is infirmary.

• Hostel is a building that provides lodging and meals for people, especially students or travelers.
• Infirmary is a place in a large institution, such as a school or prison, where sick or injured people can receive care.
• Hangar is a large building for storing aircraft.
• Dormitory is a large room or building where people sleep, especially students in a school or college.

Infirmary is the most appropriate word for the given group of words because it specifically refers to a place in a large institution where sick or injured people can receive care. It is derived from the Latin word infirmus, meaning "weak or frail."