This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Pharmacology
Oral rehydration therapy takes advantage of which transporter in GIT - 
Select and explain. 
A. Na Glucose co transport, B. K glucose co transport, C. Na calcium co transport, D. Na channel
A: Na Glucose co transport
Answer: A: Na Glucose co transport 
Explanation: Ans. is 'a' i.e., Na Glucose co transport * Oral rehydration is possible if glucose is added with salt. It capitalizes on the intactness of glucose coupled Na+ absorption (Na glucose co transport), even when other mechanisms have failed or when intestinal secretion is excessive, because the secreted fluid lacks glucose and cannot be reabsorbed.