This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Management and Long-Term Consequences, Subject name: Gynaecology & Obstetrics
First sign of magnesium sulphate toxicity is? 
Select and explain. 
A. Loss of deep tendon reflexes, B. Respiratory depression, C. Cardiac arrest', D. Decrease urinary output
A: Loss of deep tendon reflexes
Answer: A: Loss of deep tendon reflexes 
Explanation: Ans. (a) Loss of deep tendon reflexesRef : William's 23ed e. p-738