This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ecotopic Pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'A female presents with 8 weeks amenorrhea with pain left lower abdomen. On USG, there was thick endometrium with mass in lateral adnexa. Most probable diagnosis: \nSelect and explain. \nA. Ectopic pregnancy, B. Torsion of dermoid cyst, C. Tubo-ovarian mass, D. Hydrosalpinx', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is a, i.e. Ectopic pregnancyRef William's Obstetrics 23/e, p 242, 243; Dutta Obs. 7/e, p 181A female with 8 weeks amenorrhea with pain left lower abdomen and on USG, thick endometrium with mass in lateral adnexa is suggestive of ectopic pregnancy.", 'role': 'assistant'}]