This interactive pie chart visualizes mental health survey data, showing how a selected metric (such as depression or academic pressure) varies across a chosen attribute like gender or academic year, filtered by university. Users adjust three dropdowns to explore different combinations. The visualization uses D3.js version 7.8.5, employing the `pie()` and `arc()` generators to create slices, `rollups()` for aggregation, and SVG elements for rendering. The code reads from the provided MentalHealthSurvey.csv file and updates the chart dynamically based on user selections.