challenge: Who was Edward Charles Spitzka an expert witness for in 1881?
  
  A. The trial of Lee Harvey Oswald, accused of the assassination of President John F. Kennedy
  B. The trial of John Wilkes Booth, accused of the assassination of President Abraham Lincoln
  C. The trial of Charles J. Guiteau, accused of the assassination of President James A. Garfield
  D. The trial of Leon Czolgosz, accused of the assassination of President William McKinley
  Answer: 