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': 'Best site for blood collection for toxicology sampling: NEET 13 \nSelect and explain. \nA. Abdominal aoa, B. Femoral vein, C. Carotid aery, D. Hea', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Femoral vein', 'role': 'assistant'}]