A 37 year old woman presents with fatigue. Examination: angular stomatitis, no koilonychea. Choose the single cell type you will find on the blood film

The key is A. Macrocytes. [This is macrocytic anaemia. The cause here is VIT. B12 or folate deficiency. Points in favour of Vit. B12 or folate deficiency: i) fatigue (anaemia) ii) angular stomatitis (can be seen in Vit. B12 or folate deficiency) iii) absence of koilonychea is against IDA (Iron Deficiency Anaemia)].