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': 'A 60 yr old female with H/O 8 blood transfusion in 2 years. Her Hb- 60g/L, TLC-5800, platelet-3.4 lakhs, MCV 60, RBC-2.1 lakhs/mm3. He is having hypochromic microcytic anemia. Which investigation is not needed - \nSelect and explain. \nA. Evaluation for pulmonary hemosiderosis, B. Urinary hemosiderin, C. Bone marrow examination, D. G I endoscopy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]