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
The base not present in DNA is: 
Select and explain. 
A. Adenine, B. Uracil, C. Guanine, D. Thymine
B: Uracil
Answer: B: Uracil 
Explanation: Uracil