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': 'Corpus luteum cyst occurs due to: \nSelect and explain. \nA. HCG, B. HPL, C. Estrogen, D. Progesterone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Grandiose lutein cyst\n\nFunctional, non neoplastic.enlargement of the ovary.:,\nPersistent corpus luteum cyst may cause local pain,\ntenderness or delayed menstruation\nCysts are often palpable clinically\nUsually resolve spontaneously\n\n\u200bTheca lutein cyst\n\nThey are associated tropphoblastic\xa0disease, chorionic gonadotrophin therapy (HCG) & clomiphene therapy.\nThey are bilateral and filled with straw coloured fluid.\nThey resolve spontaneously after elimination of the H mole, therapeutic curettage, destruction of chorio-carcinoma or discontinuation of gonadotrophin therapy.', 'role': 'assistant'}]