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
[{'content': 'The lung tumour responding best to radiotherapy? \nSelect and explain. \nA. Small cell anaplastic, B. Squamous cell CA, C. Adeno CA, D. All respond equally well', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Small cell anaplastic", 'role': 'assistant'}]