The most practical fuel for a thermonuclear reactor, both from economical and nuclear consideration is

The most practical fuel for a thermonuclear reactor, both from economical and nuclear consideration is Correct Answer Deuterium

Most commercial nuclear reactors use normal water (also called light water) as a neutron moderator.
Some reactor designs, such as the CANDU reactor, use heavy water.
A heavy water molecule contains deuterium (Hydrogen-2), which is an isotope of hydrogen that has a neutron in its nucleus in addition to the proton.

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