١   تعتبر الشمس والحراره محفز لخلايا الmast cells التي تفرز بدورها مواد الحساسيه مثل الهيستامين و السيروتونين التي https      twitter  com  kuwman99  status  749525135938449408
Determine the primary topic of the given news piece from these options: spiritual, human-rights-press-freedom, business-and-economy, sports, science-and-technology, education, environment, health, art-and-entertainment, politics. Return only the label without any explanation, justification or additional text.