The Girdler sulfide (GS) process, also known as the GeibSpevack (GS) process, is an industrial production method for filtering out of natural water the heavy water (deuterium oxide = DO) which is used in particle research, in Deuterium NMR spectroscopy, deuterated solvents for proton NMR spectroscopy, in heavy water nuclear reactors (as a coolant and moderator) and in deuterated drugs.

Can we draw the following conclusion?
The use of the Girdler sulfide process will cease in 2021.

OPTIONS:
 - Yes
 - It's impossible to say
 - No
It's impossible to say