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
Wlthdrawl bleeding occurs whon progestlng admfnisterd contfnuously : 
Select and explain. 
A. Estrogen concentration is sutticient, B. Sltructural abnormality in the pelvis, C. Associated with endocrine disorder, D. Atrophic endometrium
A: Estrogen concentration is sutticient
Answer: A: Estrogen concentration is sutticient 
Explanation: Estrogen concentration is sutticient