This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Physiology, Subject name: Physiology
Microcytic Hypochromic anemia is seen in: 
Select and explain. 
A. Iron deficiency, B. Thalassemia, C. Hypoproteinemia, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None