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: Pathology
[{'content': 'A 40 year old female patient complains of weakness and loss of appetite. Patient is a known case of non-hodgkin’s lymphoma. Lymph node examination shows involvement of Waldeyer’s ring. The clinical staging for this  patient is? \nSelect and explain. \nA. Stage I, B. Stage II, C. Stage III, D. Stage IV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]