Update app.py

app.py

@@ -454,9 +454,9 @@ with gr.Blocks(css=css_styling, title=page_title, theme=osium_theme) as demo:
             gr.Markdown("### The target antimicrobial activity of your textile coating")
             antimicrobial_activity_target = gr.Text(label="Enter the minimum acceptable antimicrobial activity for your textile coating")
             gr.Markwdown("### Your constraints")
-            substrate = gr.Dropdown(label="Your substrate", choices=[c in test_data_columns if c.startwith("Substrate")])
+            substrate = gr.Dropdown(label="Your substrate", choices=[c for c in test_data_columns if c.startwith("Substrate")])
             num_washing_cycles = gr.Text("Your number of washing cycles")
-            microorganism = gr.Dropdown(label="Microorganism", choices=[c in test_data_columns if c.startwith("Microorganism")])
+            microorganism = gr.Dropdown(label="Microorganism", choices=[c for c in test_data_columns if c.startwith("Microorganism")])
 
         with gr.Column():
             with gr.Row():