เรือลำใดที่ถูกสร้างขึ้นโดย Palmers Shipbuilding and Iron Company สำหรับกองทัพเรือ
What ship was built by Palmers Shipbuilding and Iron Company for the Royal Navy?
df = pd.DataFrame(columns=['ship', 'country', 'builder'])
df[(df['country'] == 'royal navy') & (df['builder'] == 'palmers shipbuilding and iron company')]['ship']