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
Structure of proteins can be detected by all, except: 
Select and explain. 
A. High pressure liquid chromatography (HPLC), B. SDS Page, C. NMR spectrometry, D. Crystallography
A: High pressure liquid chromatography (HPLC)
Answer: A: High pressure liquid chromatography (HPLC) 
Explanation: High pressure liquid chromatography (HPLC)