<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 12-year-old girl is brought to the emergency department 3 hours after the sudden onset of colicky abdominal pain and vomiting. She also has redness and swelling of the face and lips without pruritus. Her symptoms began following a tooth extraction earlier this morning. She had a similar episode of facial swelling after a bicycle accident 1 year ago which resolved within 48 hours without treatment. Vital signs are within normal limits. Examination shows a nontender facial edema, erythema of the oral mucosa, and an enlarged tongue. The abdomen is soft and there is tenderness to palpation over the lower quadrants. An abdominal ultrasound shows segmental thickening of the intestinal wall. Which of the following is the most likely cause of this patients condition?? A: Drug-induced bradykinin excess, B: Complement inhibitor deficiency, C: Immune-complex deposition, D: Leukotriene overproduction, E: T-cell mediated immune reaction,  <response>: This is a clinical vignette describing a 12-year-old girl with abdominal pain, vomiting, facial swelling, and oral mucosal erythema that began after a tooth extraction. She had a similar reaction after an injury a year ago. Her abdominal exam shows tenderness and ultrasound reveals intestinal wall thickening, suggesting an acute abdominal process. The history of two episodes of angioedema following possible tissue injury points towards complement mediated activation and bradykinin release. Choice A, drug-induced bradykinin excess, is plausible. Choice B, complement inhibitor deficiency, would lead to uncontrolled complement activation and likely recurrent angioedema, making it a strong possibility.Choice C, immune-complex deposition, could cause episodic angioedema but would not explain the abdominal findings.Choice D, leukotriene overproduction, could cause angioedema but is less likely to be recurrent and episodic. Choice E, T-cell mediated reaction, could cause episodic angioedema but would not lead to intestinal wall thickening.Overall, choice B of complement inhibitor deficiency best fits the clinical picture of recurrent angioedema and acute abdominal findings.B: Complement inhibitor deficiency 