Final answer:
The shortest person among P, Q, R, S, and T is S.
Step-by-step explanation:
To find out who among P, Q, R, S, and T is the shortest, we need to analyze the given information. The information states that Q is shorter than only T, and S is shorter than P and Q. Since each person has a different height, we can conclude that T is the tallest since Q is shorter than only T. Additionally, since S is shorter than P and Q, and Q is shorter than T, S must be the shortest among them.
Therefore, the answer is S.