Why is the effect of pheromones in humans considered debatable?

• A. Pheromones and humans
• B. Hormones
• C. Target cells
• D. Endocrine glands

Answer: (A)

At the heart of this item is whether humans respond to pheromones in a way that reliably influences behavior. In animals, pheromones clearly guide mating, territory, and social signals. In humans, the evidence is mixed and often small in effect, varying with context, individual differences, and expectations. Some studies report changes in mood or attraction, but these findings are hard to replicate and can be explained by general olfactory cues, placebo effects, or cultural and cognitive factors rather than a dedicated pheromone system. Adding to the ambiguity, the proposed facially specialized pathways, like a functional vomeronasal system in adults, are controversial and not universally supported. Because of these inconsistent results and methodological challenges, the idea that pheromones have a clear, robust effect on human behavior remains a debated topic.