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: Surgery
Most common cause of Pseudomyxoma Peritonei is 
Select and explain. 
A. Mucinous tumour of appendix, B. Ovarian tumour, C. Colorectal carcinoma, D. None of the above
A: Mucinous tumour of appendix
Answer: A: Mucinous tumour of appendix 
Explanation: Most common cause of Pseudomyxoma Peritonei is mucinoous tumour of appendix > mucinous tumour of ovary.