Q: Fact 1: Male dogs use pheromones in urine to mark their territory. Fact 2: Pheromones are natural aphrodisiacs. Given the two facts above, what do male dogs use in urine to mark their territory?

Pick your answer from:
(a). Natural aphrodisiacs;
(b). competing for resources;
(c). Tails;
(d). Urine cleaner;
(e). Something coming from a gland;
(f). Chemical energy;
(g). an area swollen with pus;
(h). Chew toys;
The answer is:
(a).