Task: Question Answering
Input (English): Question: In a certain province in France there are 13 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: 76

 Option B: 78

 Option C: 75

 Option D: 98

 Option E: 72
Output (English): Option B