In a class of five students, P, Q, R, S, and T, P is taller than Q but shorter than R. S is shorter than T. Who is the tallest?
Answer: C. R
Since P is shorter than R, R must be taller than P. T is taller than S, but we don't know how T compares to R. However, since R is taller than P and there are no indications that T is taller than R, R is the tallest.