You will be given a definition of a task first, then some input of the task.
In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Among the entities, try to find the best entity that is most likely to fill in "_" and classify the answers based on options.

Baltimore, Maryland (CNN) -- President Obama and House GOP leaders promised greater efforts to step back from the partisan brink Friday, acknowledging that Washington's toxic political climate has made it increasingly tough to tackle major problems. The pledge was immediately called into question, however, as the two parties repeatedly expressed sharply differing viewpoints during a rare meeting at a House Republican retreat in Baltimore. Obama accepted an invitation from House GOP leaders to address their caucus. His speech Friday was followed by an often pointed question-and-answer session. "House Republican leaders are grateful for [Obama's] willingness to come ... and have a frank and honest conversation," said Rep. Mike Pence, R-Indiana. "We welcome the dialogue with the president."NEW: House Minority Leader John Boehner says the day "went very well"President Obama says stimulus plan saved jobs in GOP districtsObama says some Republicans acted as if health care plan was "some Bolshevik plot"Obama says Democrats, Republicans both are to blame for "sour climate" on Capitol Hill 
 Questions:"Both sides can take some blame for a sour climate on Capitol Hill," Obama said, adding that _ and Republicans need to be careful in choosing their rhetoric. (A) Baltimore (B) Maryland (C) CNN (D) Obama (E) House (F) GOP (G) Washington (H) Republican (I) Mike Pence (J) R-Indiana (K) John Boehner (L) Republicans (M) Bolshevik (N) Democrats (O) Capitol Hill
Output:
(N)