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: Medicine
[{'content': 'A 25-years old female developed secondary amenorrhoea of 6 month duration. Even after administration of oestrogen and progesterone for two weeks, there was no vaginal bleeding. The underlying cause could be in the - \nSelect and explain. \nA. Pituitary glands, B. Hypothalamus, C. Uterus, D. Ovary', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]