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: Pediatrics
Which of the following findings is diagnostic of iron deficiency anaemia? 
Select and explain. 
A. Increased TIBC, decreased serum ferritin, Transferrin ferritin index > 2, B. Decreased TIBC, decreased serum ferritin, Transferrin ferritin index <1, C. Increased TIBC, increased serum ferritin, Transferrin ferritin index >1, D. Increased TIBC, decreased serum ferritin, Transferrin ferritin index >1
A: Increased TIBC, decreased serum ferritin, Transferrin ferritin index > 2
Answer: A: Increased TIBC, decreased serum ferritin, Transferrin ferritin index > 2 
Explanation: Iron deficiency anaemia
TIBC - Increased
Serum ferritin - decreased
Transferrin ferritin index >2