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
[{'content': "Ehrlich's test is done to detect: \nSelect and explain. \nA. Urinary amylase, B. Urinary cystine, C. Abnormal porphyrin, D. Urobilinogen", 'role': 'user'}, {'content': 'Answer: D \nExplanation: D Harper, 26th ed, p. 283 & 25th ed, p. 370', 'role': 'assistant'}]