You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Bern

Context:
A number of congresses of the socialist First and Second Internationals were held in Bern, particularly during World War I when Switzerland was neutral; see Bern International.

Question:
What congresses were held in Bern?

First and Second Internationals