Kenema is the second largest city in Sierra Leone, and the largest city in the Eastern Province of Sierra Leone. The city is the capital of Kenema District and is a major economic center of the Eastern Province. Kenema officially overtook Bo as Sierra Leone second largest city, after it's surpassed Bo by population in the 2015 Sierra Leone national census.

Can we draw the following conclusion?
As of 2015 Bo is the 2nd biggest metro in Sierra Leone.

pick from the following.
 + Yes.
 + It's impossible to say.
 + No.
No