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: Gynaecology & Obstetrics
[{'content': 'Best investigation to establish the diagnosis of endometriosis is: \nSelect and explain. \nA. Laparoscopy, B. USG, C. X-ray pelvis, D. CT Scan', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Diagnostic laparoscopy is the gold standard for diagnosing endometriosis.\nTypical lesion: Powder burn/Gun shot lesions (black, dark brown, or bluish cysts with old hemorrhage surrounded by variable degree of fibrosis)\nOther non-typical findings could be:\n• Red implants\n• Serous or clear vesicles\n• White plaques/scarring\n• Yellowish brown discoloration of peritoneum\n• Sub ovarian adhesions\n• Presence of defects in the peritoneum (usually scarring overlying implants) is called as Allen masters syndrome.\n• Histological confirmation of laparoscopic impression is essential for diagnosis of endometriosis.', 'role': 'assistant'}]