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
Diagnosis of imminent ovulation is : 
Select and explain. 
A. Endometrial biopsy, B. Pain, C. Temperature cha, D. LH surge
D: LH surge
Answer: D: LH surge 
Explanation: LH surge