This interactive bar chart compares health metrics by sex, showing average values for age, cholesterol, resting blood pressure, max heart rate, or ST depression from heart disease patient data. A dropdown menu switches the y-axis metric, and clicking a bar dims the other category to highlight the selected sex. Built with React and D3 v7, it uses `scaleBand`, `scaleLinear`, and `group` to aggregate data, with axes rendered via `axisBottom` and `axisLeft`.