A 6-year-old boy is brought to his pediatrician’s office by his parents, who report that the child has been unusually thirsty for the past week. He also has increased urinary frequency and has wet the bed three times in the past two weeks. A random blood glucose level is 215 mg/dL. The pediatrician suspects that the child has type 1 diabetes mellitus caused by autoimmune destruction of insulin-producing pancreatic b cells. Which of the following is the transporter for glucose to enter pancreatic b cells?
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(A) GLUT 1
(B) GLUT 2
(C) GLUT 4
(D) Simple diffusion