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: Biochemistry
Spatial relationship of every atom in a molecule is known as: 
Select and explain. 
A. Conformation, B. Configuration, C. Both of the above, D. None of the above
A: Conformation
Answer: A: Conformation 
Explanation: The terms configuration and conformation are often confused:

Configuration refers to the geometric relationship between a given set of atoms, for example, those that distinguish l- from d-amino acids. Interconversion of configurational alternatives requires breaking (and reforming) covalent bonds.
Conformation refers to the spatial relationship of every atom in a molecule.

Ref: Harper’s illustrated biochemistry. 30th edition page no: 36