Task: Question Answering
Input (English): Question: In a certain province in Russia there are 15 cities. If a single road segment connects only two cities, how many road segments are required in order to connect the cities so that each city is connected to all other cities with a single road segment?

 Option A: 30

 Option B: 105

 Option C: 330

 Option D: 14!

 Option E: 15!
Output (English): Option B