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: Dental
Which of the following is the definition of conscious sedation? 
Select and explain. 
A. A minimally depressed level of consciousness that retains the patient’s ability to independently and continuously maintain an airway and respond appropriately to physical stimulation or verbal command., B. A significantly depressed level of consciousness that retains the patient’s ability to independently and continuously maintain an airway and respond appropriately to physical stimulation or verbal command., C. A minimally depressed level of consciousness that retains the patient’s ability to independently and continuously maintain an airway., D. A significantly depressed level of consciousness that retains the patient’s ability to independently and continuously maintain an airway.
A: A minimally depressed level of consciousness that retains the patient’s ability to independently and continuously maintain an airway and respond appropriately to physical stimulation or verbal command.
Answer: A: A minimally depressed level of consciousness that retains the patient’s ability to independently and continuously maintain an airway and respond appropriately to physical stimulation or verbal command. 
Explanation: Conscious sedation is defined as a minimally depressed level of consciousness as opposed to deep sedation or general anesthesia. Remember that there are four stages of anesthesia (analgesia → delirium → surgical anesthesia → respiratory paralysis) and only in the first stage (analgesia) is the patient conscious. The patient should be able to maintain an airway and respond to stimulation and command.