Q: Fact 1: Most plants continue to grow throughout their lives.  Fact 2: All orange trees are plants.  Given the two facts above, what continues to grow throughout their lives?

OPTIONS:
 1). Chemical energy;
 2). bacteria;
 3). animals;
 4). Humans;
 5). Orange Trees;
 6). Cats;
 7). an organism's body;
 8). Dogs;
The answer is:
5).