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
Hypoxia without cyanosis is? 
Select and explain. 
A. Stagnant hypoxia, B. Hypoxic hypoxia, C. Anemic hypoxia, D. Histotoxic hypoxia
C: Anemic hypoxia
Answer: C: Anemic hypoxia 
Explanation: Anemic hypoxia REF: Ganong's physiology 22nd edition, chapter 37, Fundamentals of Human Physiology by Lauralee Sherwood page 371 See APPENDIX-16 for "Types of hypoxia" Indirect repeat from June 2008, June 2010 "Approximately 5 g/dL of unoxygenated hemoglobin in the capillaries generates the dark blue color appreciated clinically as cyanosis. For this reason, patients who are anemic maybe hypoxemic without showing any cyanosis"