A 16 year old female presents with generalized weakness and palpitations.Her Hb is 7g/dl and peripheral smear shows microcytic hypochromic anaemia, reticulocyte count =0.8% serembilirubin =1 mg%.The most likely diagnosis is -

• A. Iron deficiency anaemia
• B. Haemolytic anaemia
• C. Aplastic anaemia
• D. Folic acid deficiency