This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Toxicology - Concepts, Statutes, Evidence, and Techniques, Subject name: Forensic Medicine
Vineyard sprayer's lung is due to? 
Select and explain. 
A. Thallium toxicity, B. Chronic CuSO4 poisoning, C. Chronic arsenic poisoning, D. Potassium permanganate toxicity
B: Chronic CuSO4 poisoning
Answer: B: Chronic CuSO4 poisoning 
Explanation: Ans. (b) Chronic CuS04 poisoningRef. Forensic medicine and toxicology R.N. Karmakar, 3/e, p 94, Clinical immunotoxicology by David S. Newcombe, p 233