How to clean eyeglasses<br>Wash your hands before cleaning your glasses. Wash up for 20 seconds with lotion-free soap and warm water. You'll need to make sure your hands are free of dirt, grease, and grime before cleaning your glasses.

Choose your answer: based on the paragraph above can we conclude that "You have to wash your hands for exactly 20 seconds."?

Choices: i. Yes. ii. It's impossible to say. iii. No.
I think the answer is