This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endometriosis and dysmenorrhea, Subject name: Gynaecology & Obstetrics
True about endometriosis is/are : 
Select and explain. 
A. Most common in 3rd or 4th decade, B. Premenstrual spotting absent, C. Endometrial sarcoma is most common, D. True cyst
A: Most common in 3rd or 4th decade
Answer: A: Most common in 3rd or 4th decade 
Explanation: Most common age group is between 30-45years Abnormal menstruation seen in 20% Menorrhagia is seen If the ovaries are also involved polymenorrhea, epimenorrhagia may be pronounced May be premenstrual spotting seen Malignancy is rare, commonest being adenocarcinoma Reference: D.C.DUTTA'S TEXTBOOKOF GYNECOLOGY; 6th edition; Page no: 306