When penicillin was first developed in 1940, many doctors regarded it as a Panacea that would end all infectious diseases.
I would have to say the answer is C.
A is incorrect since hydrogen is not an air pollutant.
B is incorrect because ozone is most definitely one of the top.
And D has cyanide which is a chemical for suicide during wars.
Hope this helps!
That would be 2 it goes into all those numbers
Over active bladder ( OAB )
