This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'A patient has received 8 blood transfusion in last few yrs, has Hb: 6.0g/l and RBCs 2 lakh/cu mm with MCV=64. Which of the following investigation is not required to be done in evaluating this patient? \nSelect and explain. \nA. Tests for pulmonary hemosiderosis, B. GI endoscopy, C. Urine hemosiderin, D. Bone marrow examination', 'role': 'user'}, {'content': "Answer: D \nExplanation: As the blood is transferred from outside, bone marrow does not show any significant changes. As there is no production or regression of the disease. Hence, bone marrow examination is not done Ref ganong's review of medical physiology 25e", 'role': 'assistant'}]