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
Which of the following is more aggressive rectal carcinoma ? 
Select and explain. 
A. Adenocarcinoma, B. Secondary mucoid carcinoma, C. Signet ring carcinoma, D. Squamous cell carcinoma
B: Secondary mucoid carcinoma
Answer: B: Secondary mucoid carcinoma 
Explanation: Ans. is 'b' i.e., Secondary mucoid carcinoma