tehaikovsky, bizel, copland, rontgen composers?

Question

which of the following is not a composers - tehaikovsky, bizel, rontgen, copland

Answer 1

Rontgen invented the x-ray:
http://en.wikipedia.org/wiki/X-rays#R.C3.B6ntgen

The others are composers, but check your spelling.

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Answer 2

The way you have spelt the names, none of them are composers but I guess you mean Rontgen who was not a composer