This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hospital waste and disaster management, Occupational health, Subject name: Social & Preventive Medicine
[{'content': 'Useful screening test for lead is measurement of: \nSelect and explain. \nA. Coproporphyrin in Urine, B. Amino-levulinic acid in urine, C. Lead in blood, D. Lead in Urine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Diagnosis of lead poisoning: Laboratory parameters Remark Coproporphyrin in Urine (CPU) > 150 mcg/L Exposure to lead Amino levulinic acid in Urine (ALAU) > 5 mg/l Indicates lead absorption Lead in blood >70 mcg/100 ml Clinical symptoms appear Lead in Urine >0.8 mg/l Lead exposure and absorption Basophilic stripling of RBC&;s Punctate basophilia Ref: Park 25th edition Pgno: 845', 'role': 'assistant'}]