This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Medicine
[{'content': 'Stage of Hodgkins lymphoma with right sided neck nodes and left inguinal node without fever - \nSelect and explain. \nA. Ia, B. IIa, C. IIIa, D. IVa', 'role': 'user'}, {'content': 'Answer: C \nExplanation: <p>According to Ann Arbor staging Classification of Hodgkin&;s disease, Stage 3 A includes involvement of lymph node regions on both sides of the diaphragm & is asymptomatic .</p><p>Reference:Harsh mohan textbook of pathology sixth edition pg no 372.</p>', 'role': 'assistant'}]