It is well known that human tears often serve to
moisten the eye, protect it from infection, and wash
away irritants; such tears are called irritant or reflex
tears. Dr. Field hypothesizes that emotional tears
have a different biological function. She suggests that
by shedding tears when under emotional stress people
excrete harmful chemicals that build up in such body
fluids as blood serum during emotional stress.
Each of the following, if true, provides some support
for Dr. Field’s hypothesis EXCEPT:
(C) The chemical composition of tears that are
induced by grit in the eye is identical to the
composition of tears induced by emotional Stress.
I think it is C
If the emotional tears are to excrete harmful chemicals then the emotional tears should have those chemicals. Irritant tears will not have those harmful chemicals.