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: Forensic Medicine
[{'content': 'In chronic arsenic poisoning the following samples can be sent for laboratory examination,except - \nSelect and explain. \nA. Nail clippings, B. Hair samples, C. Bone biopsy, D. Blood sample', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Arsenic is rapidly cleared from the blood and is distributed to various organs and tissues, where it is detectable for prolonged periods. Blood sample is thus of use only in a case of acute poisoning, but not in chronic poisoning.\nIn chronic poisoning arsenic is found in hair, nails, bones, skin etc. and its detection is possible when any of these structures is available - Parikh', 'role': 'assistant'}]