<prompt> Which type of anaemia is seen in vitamin B12 deficiency?Microcytic anemiaNormocytic anemiaDimorphicanemiaMacrocytic anemia  <response>: Macrocytic anemia- In Macrocytic anemiaRBCs are larger in size than their normal size Causes: - Vitamin B12deficiency Folic acid deficiency Alcoholism OTHER OPTIONS: OPTION A Microcytic anemia: Majority of microcytic anemia are result of insufficiency in haemoglobin synthesis or failure in haemoglobin synthesis or both. For e.g. iron deficiency. OPTION B: Normocytic anemia:Causes of normocytic anemia include acute blood loss, aplastic anemia bone marrow failure, haemolytic anemia abnormal breakdown of RBCs. OPTION C: Dimorphicanemia: In Dimorphic Anemia, two distinct forms of red cell populations exist. It can occur when iron deficiency anemia responds to iron therapy, after the transfusion of normal blood to a patient with Hypochromic Anemia and in Sideroblastic Anemia. 