<prompt> A patient has received 8 blood transfusion in last few yrs, has Hb: 6.0gl and RBCs 2 lakhcu mm with MCV64. Which of the following investigation is not required to be done in evaluating this patient?Tests for pulmonary hemosiderosisGI endoscopyUrine hemosiderinBone marrow examination  <response>: 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 ganongs review of medical physiology 25e 