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: Physiology
[{'content': 'Which of the following is not seen in humans? \nSelect and explain. \nA. Estrous cycle, B. Menstrual cycle, C. Endometrial cycle, D. Ovarian cycle', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Estrous cycle the recurring periods of estrus in adult females of most mammalian species except human and the correlated changes in the reproductive tract from one period to another.Ref: Ganong&;s review of medical physiology; 24th edition; page no:-406', 'role': 'assistant'}]