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
Cellular bearings of hereditary disease seen in 
Select and explain. 
A. DNA, B. Ribosome, C. RNA, D. Membrane
A: DNA
Answer: A: DNA 
Explanation: Hereditary information is preserved in DNA. Thus all genetic diseases are due to change in DNA.