This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Medicine
For the following findings, select the most likely type of lung cancer.Has the best prognosis of all malignant lung cancers. 
Select and explain. 
A. cancer metastatic to the lung, B. squamous cell cancer of the lung, C. adenocarcinoma of the lung, D. small cell cancer of the lung
B: squamous cell cancer of the lung
Answer: B: squamous cell cancer of the lung 
Explanation: Because of its tendency for early exfoliation and obstruction, squamous cell cancer is often detected at an earlier stage. Even correcting for this, there is some suggestion that its prognosis is still better, perhaps because of its slow growth rate.