Surface ใดมีผู้เข้ารอบรองชนะเลิศของ Conchita Martrnez arantxa sraknchez
Which Surface has a Semi finalists of conchita martínez arantxa sánchez?
df = pd.DataFrame(columns=['surface', 'semi_finalists'])
df[df['semi_finalists'] == 'Conchita Martínez Arantxa Sánchez']['surface']