A 51 year old woman presents with painful tongue and complains of tiredness. She is pale and has angular stomatitis and a smooth red tongue. There is no koilonychea. Choose the single cell type you will find on the blood film

The key is B. oval macrocytes. [Macrocytes are two types, round and oval. Oval macrocytes are seen in megaloblastic anemia which occurs due to Vit B12and/or folic acid deficiency. Glossitis (painful tongue), angular stomatitis and smooth tongue are though characteristic feature of iron deficiency but are also known features of megaloblastic anemia. Absence of koilonychea also favours megaloblastic anemia].