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 malignant carcinoma of the bladder is - 
Select and explain. 
A. Malignant vinous tumour, B. Solid tumour, C. Carcinomatous ulcer, D. Adenocarcinoma
B: Solid tumour
Answer: B: Solid tumour 
Explanation: Muscle Invasive tumor nearly always solid.