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Question
Which of the following is used as a moderator in nuclear reactor?
Options:
A .  Thorium
B .  Graphite
C .  Radium
D .  Ordinary water
Answer: Option D
"Light water" is the most commonly used moderator (roughly 75% of the world's reactors) although the term is slightly ambiguous, usually meaning natural fresh water, but could also refer to deuterium-depleted water.

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