This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Body fluid compaments, Subject name: Physiology
Which one of the following is also called "sucrose space"? 
Select and explain. 
A. Plasma membrane, B. Intracellular fluid (ICF), C. Extracellular fluid (ECF), D. Cerebrospinal fluid (CSF)
C: Extracellular fluid (ECF)
Answer: C: Extracellular fluid (ECF) 
Explanation: The saccharides such as inulin, mannitol, sucrose are used to measure the volume of ECF. Thus, "sucrose space" is the space or volume measured by sucrose, i.e. the ECF.