This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
[{'content': 'White vitriol is - \nSelect and explain. \nA. Lead sulphate, B. Zinc phosphate, C. Copper sulphate, D. Zinc sulphate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Zinc sulphate:White vitriol * Colourless crystalline salt REF;THE SYNOPSIS OF FORENSIC MEDICINE:KS NARAYANA REDDY;28th EDITION;PAGE NO 311', 'role': 'assistant'}]