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: Surgery
[{'content': 'A pt. operated for direct inguinal hernia developed anaesthesia at the root of the penis and adjacent part of the scrotum the nerve likely to be injured is - \nSelect and explain. \nA. Genital br. of genitofemoral nerve (supply dartos muscle), B. Femoral br. of genitofemoral nerve, C. Iliohypogastric nerve, D. Ilioinguinal nerve', 'role': 'user'}, {'content': 'Answer: D \nExplanation: All the three nerves ie genifotemoral, ilioinguinal & iliohypogastric are branches of the lumbar plexus and all may be injured in op. for hernia.\n\nllioinguinal-Nerve \n\nenters the inguinal canal by piercing the internal oblique muscle (not through the deep ring)*\nit then emerges from the superficial inguinal ring to supply the skin of\nproximomedial skin of the thigh\nthe skin over the penile root.\nthe upper part of the scrotum\n\nIliohypogastric nerves\n\ndivides into two branches - lateral cutaneous and anterior cutaneous.\nlateral cutaneous supplies - posterolateral gluteal skin\nAnterior cutaneous supplies - suprapubic skin\n\nGenitofemoral nerve \n\ndivides into two branches\nGenital and\nFemoral\n\nGenital or of Genitofemoral nerve - enters the inguinal canal at its deep ring and supplies\n\nthe Cremaster*\nthe scrotal skin*\n\nFemoral or of genitofemoral nerve\n\npasses behind the inguinal ligament, enters the femoral sheath lateral to femoral artery*, pierces the ant layer of the femoral sheath and fascia lata and supplies the skin anterior to the upper part of the femoral triangle.', 'role': 'assistant'}]