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
Higher pulse frequency of GnRH 
Select and explain. 
A. Stimulates FSH Preferentially, B. Stimulates LH Preferentially, C. Decreases both FSH and LH, D. Decreases LH preferentially
B: Stimulates LH Preferentially
Answer: B: Stimulates LH Preferentially 
Explanation: Higher pulse frequency preferentially stimulates LH, whereas lower frequency favors FSH secretion.