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
Hypocalcemia is seen in poisoning of: March 2003 
Select and explain. 
A. Ammonia, B. Salicylates, C. Carbolic acid, D. Oxalic acid
D: Oxalic acid
Answer: D: Oxalic acid 
Explanation: Ans. D i.e. Oxalic acid