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: Pathology
42 years old female presents diagnosed as iron deficiency anemia was staed on oral iron therapy and her Hb condition during review was 8 g%. The cause for failure of treatment is 
Select and explain. 
A. Acquired sideroblastic anemia, B. Inadequate iron dosage, C. Poor compliance to oral iron, D. Folate deficiency
C: Poor compliance to oral iron
Answer: C: Poor compliance to oral iron 
Explanation: . Poor compliance to oral iron