context: Abraham Lincoln (February 12, 1809-April 15, 1865) served as the 16th president of the United States from March 1861 to April 1865, when he was assassinated. He succeeded in bringing the country out of the great internal crisis of the Civil War, preserving the Union and ending slavery. Since he was from a poor family living in a pioneering frontier in the northwestern United States at the time, he had no choice but to study for himself, rather than learn at school. He later became a lawyer, became an Illinois lawmaker, once served as a US Congressman, but failed twice in the Senate election. He did not spend much time with his family, but was a caring husband and father of four children.
question: How many presidents is Abraham Lincoln?
answers.text: 16