This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Menstrual Cycle, Subject name: Gynaecology & Obstetrics
[{'content': 'What is seen in luteal phase - \nSelect and explain. \nA. Increased progesterone levels, B. Decreased progesterone levels, C. Decreased estrogen level, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Increased progesterone levels "Corpus luteum secretes progesterone, the level of which starts rising"', 'role': 'assistant'}]