This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Bio-Chemistry), Subject name: Biochemistry
Ehrlich's test is done to detect: 
Select and explain. 
A. Urinary amylase, B. Urinary cystine, C. Abnormal porphyrin, D. Urobilinogen
D: Urobilinogen
Answer: D: Urobilinogen 
Explanation: D Harper, 26th ed, p. 283 & 25th ed, p. 370