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: Pharmacology
Tolbutamide acts by increasing: 
Select and explain. 
A. Insulin receptors, B. Glucose entry, C. Glucose absorption, D. Insulin secretion
D: Insulin secretion
Answer: D: Insulin secretion 
Explanation: None