Collins Hickey Johnston (August 29, 1859 December 29, 1936) was an American football player, medical doctor, surgeon, and civic leader in Grand Rapids, Michigan. He was a graduate of the University of Michigan where he played college football for the 1879 Michigan Wolverines football team, the first football team to represent the University of Michigan.

Based on that paragraph can we conclude that this sentence is true?
He was a graduate of the University of Michigan that became a medical doctor, which was rare at the time.
It's impossible to say