9907
Completed in 1949 , it is the only bridge spanning the Mississippi River designed to carry exclusively vehicular traffic that was built before 1950 .
 location: Mississippi River
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Mississippi River 
Answer:
 location: Mississippi River