This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Biochemistry
GLUT responsible for secretion of insulin from beta cells of pancreas 
Select and explain. 
A. 1, B. 2, C. 3, D. 4
B: 2
Answer: B: 2 
Explanation: Glucose transpoer 2 (GLUT2) also known as solute carrier family 2 (facilitated glucose transpoer), member 2 (SLC2A2) is a transmembrane carrier protein that enables protein facilitated glucose movement across cell membranesGLUT2 has high capacity for glucose but low affinity (high Km, ca. 15-20 mM) and thus functions as pa of the "glucose sensor" in pancreatic b-cells. It is a very efficient carrier for glucose.Ref: DM Vasudevan, 7th edition