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 primipara who had a prolonged labour and difficult vaginal delivery three months ago presents with complains of incontinence of loose stools and flatus from the day of delivery. The most likely diagnosis : 
Select and explain. 
A. Chronic diarrhoea, B. Recto-vaginal fistula, C. Haemorrhoids, D. Complete perineal tear
D: Complete perineal tear
Answer: D: Complete perineal tear 
Explanation: Complete perineal tear