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
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? 
Select and explain. 
A. Evaluation for pulmonary hemosiderosis, B. Urinary hemosiderin, C. Bone marrow examination, D. GI endoscopy
A: Evaluation for pulmonary hemosiderosis
Answer: A: Evaluation for pulmonary hemosiderosis 
Explanation: None