What is a symptom of Hairless Black Syndrome in bees?

Hairless Black Syndrome in bees is characterized by a noticeable reduction in body hair and a greasy or shiny appearance on the bees' bodies. This condition affects the bees’ ability to regulate temperature and may impact their overall health and performance within the hive. The loss of body hair can lead to increased vulnerability to environmental stressors and diseases, which can further exacerbate the condition.

The other options do not align with the symptoms associated with Hairless Black Syndrome; a healthy appearance contradicts the very nature of the syndrome, while increased activity and enhanced pollen gathering are not recognized symptoms of this condition, as those affected may actually show decreased productivity due to their compromised state.