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 35 year old woman with dysmenorrhea and menorrhagia of 6 months duration, showed an enlarged uterus of 20 weeks which was tender, the possible diagnosis is : 
Select and explain. 
A. Adenomyosis, B. Fibroid, C. Carcinoma endometrium, D. PID
B: Fibroid
Answer: B: Fibroid 
Explanation: Fibroid