A ____________ may be defined as an opening made in a wall for

a-may-be-defined-as-an-opening-made-in-a-wall-for

A ____________ may be defined as an opening made in a wall for the purpose of providing daylight, vision and ventilation.

A. Ventilator

B. Door

C. Shutter

D. Window

I had been asked this question in an international level competition.

My query is from Components of a Door topic in chapter Doors, Windows and Ventilators of Construction & Building Materials

Right option is D. Window

To explain I would say: Window is also like door consists of two parts i.e. Frame and shutter. The window frame is suitably fixed in the opening of the wall and the window shutter is held in position by the window frame.