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 60 yr old female with a history of 8 blood transfusions in 2yrs. Her Hb-60g/L, TLC-5800, platelet- 3.4 lakhs, MCV-60, RBC-2.11akhs/mm3. She 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. GI endoscopy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]