Hydrogen Analysis

you are analyzing an unknown organic molecule. the analysis reveals that only the following elements are part?
of the molecule: carbon, oxygen, and Hydrogen. The molecule is NOT:
a. sucrose
b. glycogen
c. fat
d. keratin
e. cellulose
I believe sucrose, glycogen, triglycerides (fats), and cellulose are all composed of solely of C H and O.
I’d say it’s keratin.
Boeing B/RB-52B-”Take-Off Analysis”-1956