Five books are arranged on a shelf: A, B, C, D, and E. A is to the left of B but to the right of C. D is to the right of E. Which book is at the extreme right?
In a family of five members A, B, C, D, and E, A is the father of B. C is the mother of B and D is the sister of B. E is the grandfather of B. How is D related to E?