$\"\"$

The statement is " The discriminant of parabola is zero ".

The equation is $\"\"$ .

The discriminant is defined as $\"\"$ .

The $\"\"$ and $\"\"$ terms determine the type of conic.

If $\"\"$ , then the equation represents a parabola.

For a parabola, there is no $\"\"$ term.

So for a parabola, either $\"\"$ or $\"\"$ has to be equal to $\"\"$ .

Thus, the statement is true.

$\"\"$

True.