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
The lung tumour responding best to radiotherapy- 
Select and explain. 
A. Small cell anaplastic, B. Squamous cell CA, C. Adeno CA, D. All respond equally well
A: Small cell anaplastic
Answer: A: Small cell anaplastic 
Explanation: None