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
Glucose diffusion in RBC by ? 
Select and explain. 
A. GLUT I, B. GLUT 2, C. GLUT 3, D. GLUT 4
A: GLUT I
Answer: A: GLUT I 
Explanation: Ans. is 'a' i.e., GLUT 1