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
Common toxin through vegetables: DNB 08 
Select and explain. 
A. Boric acid, B. Carbolic acid, C. Taaric acid, D. Oxalic acid
D: Oxalic acid
Answer: D: Oxalic acid 
Explanation: Ans. Oxalic acid