This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Introduction and gametogenesis., Subject name: Anatomy
Primary oocyte remains arrested in diplotene phase because of ? 
Select and explain. 
A. oocyte maturation inhibitor, B. oocyte maturation stimulator, C. acetyl choline, D. oestrogen
A: oocyte maturation inhibitor
Answer: A: oocyte maturation inhibitor 
Explanation: Oocyte maturation inhibitor acts by increasing cAMP . LH surge at pubey reduces cAMP so removing the arrest stage of oocyte .