This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pathology
[{'content': 'Which of the tumours are unique to pregnancy \nSelect and explain. \nA. Luteoma, B. Serous cystadenoma, C. Mucinous cystadenoma, D. Teratoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: *Physiological proliferation of luteal cells in response to gonadotrophins in pregnancy - Theca lutein hyperplasia of pregnancy*Pathological proliferation of luteal cells in response to gonadotrophins in pregnancy- Luteoma . Luteoma is a type of sex cord stromal tumours( Ref: Robbins 8/e p1051)', 'role': 'assistant'}]