<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 27-year-old woman was found lying unconscious on the side of the street by her friend. He immediately called the ambulance who were close to this neighborhood. On initial examination, she appears barely able to breathe. Her pupils are pinpoint. The needles she likely used were found on site but the drug she injected was unknown. The first responders were quick to administer a drug which is effectively used in these situations and her symptoms slowly began to reverse. She was taken to the nearest emergency department for further workup. Which of the following best describes the mechanism of action of the drug administered by the first responders?? A: Kappa receptor pure agonist, B: NMDA receptor antagonist, C: Alpha 2 receptor agonist, D: Mu receptor antagonist, E: Delta receptor antagonist,  <response>: This is a clinical vignette about a 27-year-old woman found unconscious likely due to opioid overdose. The key details are that she was barely breathing, had pinpoint pupils, and improved after being given a medication by first responders. Based on the clinical presentation, she likely overdosed on an opioid drug. The medication given by first responders reversed her symptoms, so it was likely naloxone. Naloxone is a competitive mu opioid receptor antagonist that can reverse opioid overdose.So the correct answer should be the one that describes a mu opioid receptor antagonist.D: Mu receptor antagonist 