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': 'Higher pulse frequency of GnRH \nSelect and explain. \nA. Stimulates FSH Preferentially, B. Stimulates LH Preferentially, C. Decreases both FSH and LH, D. Decreases LH preferentially', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Higher pulse frequency preferentially stimulates LH, whereas lower frequency favors FSH secretion.', 'role': 'assistant'}]