Fact 1: Male dogs use pheromones in urine to mark their territory. Fact 2: Pheromones are a sub-category of semiochemicals. Given the two facts above, what uses semiochemicals in urine to mark territory?

Choose your answer from:
(a). koalas;
(b). bacteria;
(c). humans;
(d). dogs;
(e). bears;
(f). cats;
(g). the Sun;
(h). rabbit;
The answer is:
(d).