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: Social & Preventive Medicine
Mapping of human genome was completed in: 
Select and explain. 
A. 2000, B. 2001, C. 2002, D. 2003
D: 2003
Answer: D: 2003 
Explanation: The Human Genome Project (HGP) is an international scientific research project with a primary goal of determining the sequence of chemical base pairs which make up DNA, and of identifying and mapping the approximately 20,000-25,000 genes of the human genome. Preliminary mapping of Human Genome Project was completed in 2003. Ref: Park 21st edition page: 766.