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
Bladder tumours mostly arises from - 
Select and explain. 
A. Mucosa, B. Submucosa, C. Muscularis Mucosa, D. S eorsa
A: Mucosa
Answer: A: Mucosa 
Explanation: None