Question of the Day #1

In the figure above, circular region P represents shirts
with pockets, circular region Q represents shirts with
buttons, and circular region R represents shirts with
collars. What is represented by the shaded region?
(A) Shirts with pockets, buttons, and collars
(B) Shirts with pockets and buttons, but without
(C) Shirts with pockets and buttons (some possibly
with collars)
(D) Shirts with pockets and collars (some possibly
with buttons)
(E) Shirts with buttons and collars (some possibly
with pockets)

The answer is:  C 

Check out the explanation to this problem here!