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: Radiology
Cranial Irradiation" is given for: 
Select and explain. 
A. Small cell cancer, B. Squamous cell cancer, C. Anaplastic cancer, D. Adenocarcinoma
A: Small cell cancer
Answer: A: Small cell cancer 
Explanation: Small cell cancer