<prompt> A patient has Hb 6gm, folic acid 8 ngml, vitamin B12 60pgml, serum iron 16011gd1, and MCV-104. The diagnosis is:Iron deficiency anemiaVitamin B12 deficinecyFolic acid deficiencyPyridoxine deficiency  <response>: Answer is B vitamin Bp is Deficiency Presence of anemia Hb 6gm Macrocytosis MCV104 and decreased vitamin B12 levels B1260 pgml suggests a diagnosis of megaloblastic anemia due to vitamin B12 deficiency. Reference values from Harrisons Appendix A Parameter Normal Values Patient value Inference Hb 13-18 gdl 6 gmldl Anemia HCV 79-93.3L 104 fL Macrocytosis Vitamin B12 250 pgml 60 pgmI Vitamin B12 deficiency Folic Acid 5.4-18.0 ngml 8 ngml Normal folate levels Iron 30-160 ugdl 160 ugdl Normal The patient in question, thus has a macrocytic anemia due to vitamin B12 deficiency. 