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
Choose the most appropriate statement about Epigenetics 
Select and explain. 
A. Irreversible modification of DNA, B. Change in genotype without change in phenotype, C. Change in nucleotide sequence, D. Heritable changes in gene expression
D: Heritable changes in gene expression
Answer: D: Heritable changes in gene expression 
Explanation: Epigenetics refers to reversible but heritable changes in gene expression without change in nucleotide sequence.
It results in change in phenotype without changes in genotype.
Refer the byte "Epigenetics"