This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, 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: Primary mucoid carcinoma gives rise to a rapidly growing bulky growth that metastasises very early and the prognosis of which is very poor Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1231