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: Surgery
Gastric tetany is due to - 
Select and explain. 
A. Increased intestinal acidity, B. Vagal Hyperactivity, C. Increased Calcium Sequestration, D. Decreased Calcium absorption
D: Decreased Calcium absorption
Answer: D: Decreased Calcium absorption 
Explanation: Ans. is 'd' i.e., Decreased Calcium absorption I could not find the answer but here is what I know Gastric tetanv is tetany due to disorders of stomach, especially with loss of HC1 by vomiting.