A ___________ may be defined as an openable barrier secured in an opening left in a wall for the purpose of providing access to the user of the structure.
A. Window
B. Door
C. Ventilator
D. Lintel
I had been asked this question during an online exam.
The origin of the question is Components of a Door in section Doors, Windows and Ventilators of Construction & Building Materials
The correct choice is B. Door
The best I can explain: Door basically consists of two parts, namely, frame and shutter. The door shutter is held in a position by the door frame which in turn is fixed in the opening of the wall by some suitable means.