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': 'Drug containing two sulfhydryl groups in a molecule: Maharashtra 09 \nSelect and explain. \nA. BAL, B. EDTA, C. Penicillamine, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. BAL', 'role': 'assistant'}]