This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Anatomy
Chvostek/Weiss sign seen in which poisoning 
Select and explain. 
A. Oxalic acid poisoning, B. Carbolic acid poisoning, C. Boric acid poisoning, D. Formic acid poisoning
A: Oxalic acid poisoning
Answer: A: Oxalic acid poisoning 
Explanation: acute poisoning. the patient may suffer from tingling and paresthesia, intermittent cramps and carpopedal spasm due to hyperirritability of peripheral nerves(Chvostek/Weiss sign) as a result of hypocalcemia. Patient may go into stupor, coma, and death may be due to respiratory failure. Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 412