I want to know the answer to the following question:
Who gave rise to the Theravada school?
All the background I'm provided with is that "Originally, these schisms were caused by disputes over vinaya, and monks following different schools of thought seem to have lived happily together in the same monasteries, but eventually, by about 100 CE if not earlier, schisms were being caused by doctrinal disagreements too.". Is that enough to answer the question?
Answer: no