This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Iron deficiency anemia, Subject name: Pathology
20-year-old female present with features of anemia. Blood tests: Hb-5g/dL, MCV - 52 fL, MCH-22 pg, PCV - 15%. Diagnosis? 
Select and explain. 
A. Phenytoin toxicity, B. Fish tapeworm infection, C. Hookworm infection, D. Blind loop syndrome
C: Hookworm infection
Answer: C: Hookworm infection 
Explanation: The findings in the question are suggestive of iron deficiency anemia. Among given options, Hookworm infection can cause iron deficiency anemia due to chronic blood loss. Associated with megaloblastic anemia (vitamin B12/folate Deficiency): Phenytoin toxicity, Blind loop syndrome and Fish tapeworm (D. latum) infection.