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: Social & Preventive Medicine
Useful screening test for lead is measurement of 
Select and explain. 
A. Amino-laevulinic acid in urine, B. Coproprophyrin in urine, C. Lead in blood, D. Lead in urine
B: Coproprophyrin in urine
Answer: B: Coproprophyrin in urine 
Explanation: Diagnosis of lead poisoning: