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: Medicine
Measurement of all proteins expressed in cell or tissue is 
Select and explain. 
A. Epigenetics, B. Genomics, C. Proteomics, D. Knockdown technology
C: Proteomics
Answer: C: Proteomics 
Explanation: Geomics - Study of all DNA sequences.
Epigenetics - heritable changes in gene expression that are not caused by alteration in DNA sequence.