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: Anatomy
All are true about trigone of bladder except: 
Select and explain. 
A. Mucosa is loosely attached to the underlying musculature, B. Mucosa is smooth, C. Lined by transitional epithelium, D. Derived from absorbed pa of the mesonephric duct
A: Mucosa is loosely attached to the underlying musculature
Answer: A: Mucosa is loosely attached to the underlying musculature 
Explanation: A i.e. Mucosa loosely attached to the underlying musculature