<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 48-year-old man with a history of nephrolithiasis presents with acute-onset left flank pain. He says that the pain started suddenly 4 hours ago and has progressively worsened. He describes the pain as severe, sharp, and localized to the left flank. The patient denies any fever, chills, nausea, vomiting, or dysuria. His past medical history is significant for nephrolithiasis diagnosed 4 years ago status post shockwave lithotripsy. The patient says, Im allergic to many pain medications, but there is one that I get all the time when I have this pain. I think it starts with D. He is afebrile and his vital signs are stable. On physical examination, he is writhing in pain and moaning. Exquisite left costovertebral angle tenderness is noted. Laboratory findings, including a urinalysis, are unremarkable. IV fluid resuscitation is administered.Which of the following is the best next step in the management of this patient?? A: Administer dilaudid hydromorphone for pain control, B: Admit to hospital floor for IV dilaudid patient-controlled analgesia, C: Administer ibuprofen and acetaminophen for pain control, D: Discharge patient with prescription of dilaudid with follow-up in 3 months, E: Non-contrast CT of the abdomen and pelvis,  <response>: This is a patient with acute onset left flank pain and a history of nephrolithiasis. The description of the pain and physical exam findings are consistent with renal colic from a kidney stone. The patient reports being allergic to many pain medications except one starting with D, likely referring to dilaudid hydromorphone. The question is asking for the best next step in management.Choice A would provide pain control but does not address the underlying cause. Choice B admits the patient but also does not address the underlying cause. Choice C provides inadequate pain control. Choice D discharges the patient without addressing the underlying cause. Choice E, a non-contrast CT of the abdomen and pelvis, is the best next step as it will allow visualization of the kidney stones and confirm the diagnosis. This will guide further treatment such as pain management and possible procedures to remove the stones.E: Non-contrast CT of the abdomen and pelvis 