This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Preoperative assessment and monitoring in anaesthesia, Subject name: Anaesthesia
Sudden decreasd end tidal CO2 in GA causes 
Select and explain. 
A. Cardiac arrest, B. Pulmonary hypeension, C. Malignant hypehermia, D. Malignant extubation
A: Cardiac arrest
Answer: A: Cardiac arrest 
Explanation: Complications of Anaesthesia During anaesthesia: > Respiratory depression - Salivation, respiratory secretions > Cardiac arrhythmias > Fall in BP >Aspiration >Laryngospasm and >asphyxia >Awareness > Delirium and convulsion > Fire and explosion