Input (grade 13): Christiaan Eijkman (; 11 August 1858, Nijkerk, Gelderland - 5 November 1930, Utrecht) was a Dutch physician and professor of physiology whose demonstration that Beriberi is caused by poor diet led to the discovery of vitamins.
Output (grade 9): Christiaan Eijkman (August 11, 1858 - November 5, 1930) was a Dutch doctor.