A is the son of C; C and Q are sisters; Z is the mother of Q and P is the son of Z. Which of the following statements is true?

Let's map out the family tree connections step-by-step:
1. $A$ is the son of $C$ ($\text{Male }A$, parent $C$).
2. $C$ and $Q$ are sisters (both are females).
3. $Z$ is the mother of $Q$, which means $Z$ is also the mother of $C$.
4. $P$ is the son of $Z$, which means $P$ is the brother of $C$ and $Q$.

Since $P$ is the brother of $A$ 's mother ($C$), $P$ is the maternal uncle (Mama) of $A$. Thus, statement C is true.