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: Anaesthesia
Following ventilation mode is not used for weaning? 
Select and explain. 
A. Pressure suppo ventilation (PSV), B. Synchronized Intermittent Mandatory Ventilation (SIMV), C. Controlled Mechanical Ventilation (CMV), D. Assist Control Ventilation (ACV)
C: Controlled Mechanical Ventilation (CMV)
Answer: C: Controlled Mechanical Ventilation (CMV) 
Explanation: Ans. is 'c' i.e., Controlled Mechanical Ventilation (CMV)