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:
Buddhism

Context:
Theravadin Buddhists believe that personal effort is required to realize rebirth. Monks follow the vinaya: meditating, teaching and serving their lay communities. Laypersons can perform good actions, producing merit.

Question:
What type of Buddhists believe that personal effort is required to realize rebirth?

Theravadin