Instructions Full Game: These are multiple-choice quizzes with four possible answer choices that include all questions in a given set.     
Identify the following individual:

Lived: 1910 - 1995
Discovered that massive stars can collapse under their own gravity to reach infinite density. Today we call these collapsed stars black holes.
Wilhelm Röntgen
Marie Curie
Subrahmanyan Chandrasekhar
John Napier