\rbqquest{
If $\overline{z}=-z$, what does that tell us about the value of $z = a+bi$?
}

\rbqchoice{
\begin{enumerate}[a)]
\item $z$ is purely imaginary.
\item $z$ is real.
\item $z$ has length $1$.
\item $z=0$.
\item None of the above.
\end{enumerate}
}

\rbqans{
Answer: (a)

$a+bi = -(a-bi)$ implies $a=-a = 0$.
}