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: Unknown
Absorption of glucose is intestine is by 
Select and explain. 
A. Secondary active transport, B. Facilitated diffusion, C. Primary active transport, D. Osmosis
A: Secondary active transport
Answer: A: Secondary active transport 
Explanation: Ref. Guyton. 13th edition. Page. 840
Primary and secondary transport 

In primary active transport, ATP is consumed directly by the transporting protein, (e.g., the Na/K-ATPase pump, or the calcium-dependent ATPase of the sarcoplasmic reticulum).  
Secondary active transport depends indirectly on ATP as a source of energy, as in the co-transport of Na-glucose in the proximal tubule. This process depends on ATP utilized by the Na/K-ATPase pump.  
Glucose moves up a concentration gradient via secondary active transport.