instruction:
Generate a correct and concise answer for the question based on the words in the context.
question:
Context : María Elena Perla López Loyo (born 2 April 1951) is a Mexican politician from the Institutional Revolutionary Party. 
Question : What kind of  occupation does Perla López Loyo have?
answer:
politician


question:
Context : By early 1945, over 2,000 M18 recoilless rifles and 800,000 rounds of ammunition were on order. 
Question : What year was M18 recoilless rifle made?
answer:
1945


question:
Context : The Royal Albert Bridge is a railway bridge which spans the River Tamar in England between Plymouth, Devon and Saltash, Cornwall bank. 
Question : Over which river does Royal Albert Bridge cross?
answer:

Tamar