How to load a file path from a callback?

I have the following function:

def origin_func():

return html.Div(                                                                  
    children=[                                                                    
        dcc.Markdown('Select country'),                              
        dcc.Dropdown(                                                             
            id='origin_div',                                                      
            options=[{'label': 'Malta', 'value': './data/malta.csv'}, {'label': 'Japan', 'value': './data/japan.csv'}],
            value='./data/malta.csv'                                   
        )                                                                         
    ]                                                                             
)

That allows associating a country with a file path (html.Div(children=[origin_func()])).

Now, I’d would like to use this path to load a Pandas Dataframe through a callback

@app.callback(
Output(‘path’, ‘children’),
Input(‘origin_div’, ‘value’)

But I cannot find how to load the Dataframe (df = pd.read_csv('path') ) into th function

def destination_func():
    return html.Div(
        children=[
            dcc.Markdown('Select country of destination'),
            dcc.Dropdown(
                id='destination_div',
                options=[{'label': i, 'value': i} for i in df['Destination'].drop_duplicates()],
                value=df['Destination'].drop_duplicates()[0]
            )
        ]
    )

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