Yahtzee

The objective of the game is to score points by rolling five dice to make certain combinations. The dice can be rolled up to three times in a turn to try to make various scoring combinations and dice must remain in the box. A game consists of thirteen rounds. After each round the player chooses which scoring category is to be used for that round. Once a category has been used in the game, it cannot be used again. The scoring categories have varying point values, some of which are fixed values and others where the score depends on the value of the dice. A Yahtzee is five-of-a-kind and scores 50 points; the highest of any category. The winner is the player who scores the most points.

Question: does yahtzee have to be in one roll
Answer: no