This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
A 25 yr old female presented with malaise and generalized weakness since 6 months. Her appetite is reduced and she has giddiness and palpitations on and off. There was no organomegaly. Laboratory study showed normochromic to hypochromic anaemia, RDW=60, and MCV=50. What is the diagnosis ? 
Select and explain. 
A. Thalasemia minor, B. Iron deficiency anaemia, C. Chronic malaria, D. Folate deficiency
B: Iron deficiency anaemia
Answer: B: Iron deficiency anaemia 
Explanation: None