How to clean a sink drain<br>Remove your drain cover. Remove any covers that are on top of your drain. If you have a pop-up drain stopper, turn the cover counter-clockwise to remove it from the drain.

Can we draw the following conclusion?
You should clean your sink drain once a year.

Select from the following.
(a). Yes;
(b). It's impossible to say;
(c). No;
(b).