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': 'Diagnosis of Hodgkins disease is based on all of the following, except: \nSelect and explain. \nA. Reed- Sternberg cells, B. Reactive cellular background, C. Atypical cells in backgriound, D. CD 30 positivity', 'role': 'user'}, {'content': "Answer: C \nExplanation: Answer is C (Atypical cells) Atypical cells may be seen in some variants of Hodgkin's disease but they are not required for the diagnosis of Hodgkin's disease", 'role': 'assistant'}]