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
In iron deficiency anemia there is: 
Select and explain. 
A. Decrease in hemoglobin, B. Increase in hemoglobin, C. Increase in platelets, D. Decrease in platelets
A: Decrease in hemoglobin
Answer: A: Decrease in hemoglobin 
Explanation: None