Wilhelm Conrad Roentgen contributed which of the following to dentistry?

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Wilhelm Conrad Roentgen discovered x-rays in 1895.
Horace Wells is credited with the discovery of inhalation anesthesia using nitrous oxide.
African Americans were not accepted at dental schools until 1867,when Harvard University initiated its first dental class and accepted Robert Tanner Freeman as its first black student.
Hazel O.Torres and Ann Ehrlich set the standard for dental assisting textbooks in 1976 when they co-authored Modern Dental Assisting.

Wilhelm Conrad Roentgen Contributed Which of the Following to Dentistry