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 of the following are poor prognostic factors for Hodgkin's disease, Except: \nSelect and explain. \nA. Younger age, B. Systemic manifestations, C. Lymphocyte depletion, D. Mediastinal disease", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is A (Younger age) Lymphocyte depletion subtype, presence of mediastinal disease and systemic manifestation are all established poor prognostic factors Stomach involvement reflects advanced stage of disease and is likely to be associated with a poor prognosis.', 'role': 'assistant'}]