There are two reading rooms at Think Town\textquotesingle s Library: Tulip\textquotesingle s and Lily\textquotesingle s. There are two lamps on every table in Tulip\textquotesingle s Reading Room. As for Lily\textquotesingle s Reading Room, there are three lamps on every table. Nini knows that the total number of lamps in the two reading rooms is an odd number, and the total number of tables in the two reading rooms is also an odd number. Which reading room has an odd number of tables? 
Overseas Competition->Knowledge Point->Number Theory Modules->Odd and Even Numbers->Odd and Even Applications
There are two lamps on every table in Tulip\textquotesingle s Reading Room, so the number of lamps in it is an even number. The total number of lamps in the two rooms is odd, and thus the number of lamps in Lily\textquotesingle s Reading Room is an odd number. Since there are three lamps on every table in Lily\textquotesingle s Reading Room, the number of tables in it is also an odd number. However, the total number of tables in the two rooms is odd, so the number of tables in Tulip\textquotesingle s is even. Therefore, the answer is $$\text{B}$$. 