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
In normal puerperium, all true regarding involution of uterus except: 
Select and explain. 
A. At the end to the 6 weeks, becomes non pregnant state, B. The number of muscle fibres is not decreased but there is substantial reduction of the myome trial cell size, C. At the end of the 4th week uterus becomes a pelvic organ, D. Weight of uterus about 60 gram at end of six weeks
C: At the end of the 4th week uterus becomes a pelvic organ
Answer: C: At the end of the 4th week uterus becomes a pelvic organ 
Explanation: None