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
Which of the following statement is true about Hb-O2
 dissociation curve? 
Select and explain. 
A. Fetal Hb shifts curve to left, B. Hypothermia shifts curve to right, C. Hypercarbia shifts curve to left, D. Left shift cause more O2 release
A: Fetal Hb shifts curve to left
Answer: A: Fetal Hb shifts curve to left 
Explanation: None