Read the text and determine if the sentence is true (see options at the end):

How to stop erosion on a river bank<br>Use coir netting that's 700-900 grams per square meter (gsm). Coir netting is made from coconut fibers and is biodegradable. Normal or heavy duty netting should be used when there is a large amount of water flow.

Sentence: coir netting is made from optic fibers
Available options: a). Yes. b). It's impossible to say. c). No.