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
Antidote for oxalic acid poisoning - 
Select and explain. 
A. BAL, B. Animal charcoal, C. Calcium gluconate, D. Magnesium
C: Calcium gluconate
Answer: C: Calcium gluconate 
Explanation: Antidote : Any calcium preparation (e.g. calcium gluconate/chloride, lime water, suspension of chalk), which converts poison into insoluble calcium oxalate is an antidote for oxalate poisoning.