This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Using histological criteria to date endometrial development, which of the following is the earliest sign of ovulation? not related - gyn 
Select and explain. 
A. Gland coiling, B. Stromal edema, C. Neovascularization, D. Glycogen accumulation
D: Glycogen accumulation
Answer: D: Glycogen accumulation 
Explanation: .