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
Chostek's and Trousseau's Signs is seen in which poisoning? 
Select and explain. 
A. Oxalic acid, B. Strichynine, C. Hydrocyanic acid, D. Arsenic
A: Oxalic acid
Answer: A: Oxalic acid 
Explanation: Oxalic acid REF: Parikh 6th edition page 8.33 Chvostek's and Trousseau's Signs is seen in hypocalcemia. Oxalic acid combines with serum calcium to form insoluble calcium oxalate to cause hypocalcemia