X and Y are children of Z. Z is the son of W. How is W related to Y?

  • A. Father
  • B. Grandfather
  • C. Uncle
  • D. Brother

Explanation

Z sits one generation below W and one above Y, so W is Y's grandfather. The word son fixes Z as male but says nothing about Y's gender, which is not needed here. Counting the steps between generations gives the answer directly.

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