[A] Marie Curie
[B] J.J Thomson
[C] W.C Roentgen
[D] James Chadwick
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The correct answer is [C] W.C Roentgen
Wilhelm Conrad Roentgen was the German physicist who first systematically produced and detected electromagnetic radiation in a wavelength range that is today known as X-rays.
This discovery followed the earlier discovery of X-rays by Röntgen in November 1895 and revolutionized the fields of physics and medicine.