18448
When the BBC started the world 's first practical television service with experimental transmissions in 1936 one of the types of programmes it produced were variety shows with circus artists .
 BBC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 BBC