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: Physiology
Iron binding protein is: September 2010 
Select and explain. 
A. Ferritin, B. Ferropoin 1, C. Transferrin, D. Hephaestin
C: Transferrin
Answer: C: Transferrin 
Explanation: Ans. C: TransferrinIron-binding proteins are carrier proteins and metalloproteins which play many impoant roles in metabolism. They bind Iron and can therefore inhibit microbial growth.Two iron-binding proteins are lactoferrin and transferrin.Some of the iron after absorption is stored in ferritin, and the remainder is transpoed out of the enterocytes by a transpoer named ferropoin 1. Hephaestin is associated with ferropoin 1.