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
A 48-years-old female suffering from severe menorrhagia (DUB) underwent hysterectomy. She wishes to take hormone replacement therapy. Physical examination and breast are normal but X-ray shows osteoporosis. The treatment of choice is: 
Select and explain. 
A. Progesterone, B. Estrogen and progesterone, C. Estrogen, D. None
C: Estrogen
Answer: C: Estrogen 
Explanation: None