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: Medicine
[{'content': "All are true regarding Hodgkin's lymphoma,except - \nSelect and explain. \nA. CNS is the commonest site of involvement, B. Characteristic cell is a Reed Sternberg cell, C. Mediastinal involvement is common in nodularsclerosis type., D. Eosinophils, plasma cells and neutrophils increase", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]