This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Pigment providing colour to stool is - 
Select and explain. 
A. Stercobilinogen, B. Urobillinogen, C. Mevobilirubin, D. Bilirubin
A: Stercobilinogen
Answer: A: Stercobilinogen 
Explanation: The characteristic brown colour of feces is due to the presence of pigment stercobilin (derived from stercobilinogen).

So, actually it is stercobilin (not stercobilinogen) which is responsible for the brown color of feces. Stercobilin is derived from stercobilinogen and therefore stercobilinogen is the best answer amongst the options provided.