<Table> <Tr> <Th_colspan="2"> The Big Bang Theory </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Genre </Th> <Td> Sitcom </Td> </Tr> <Tr> <Th> Created by </Th> <Td> Chuck Lorre Bill Prady </Td> </Tr> <Tr> <Th> Directed by </Th> <Td> Mark Cendrowski </Td> </Tr> <Tr> <Th> Starring </Th> <Td> <Ul> <Li> Johnny Galecki </Li> <Li> Jim Parsons </Li> <Li> Kaley Cuoco </Li> <Li> Simon Helberg </Li> <Li> Kunal Nayyar </Li> <Li> Sara Gilbert </Li> <Li> Mayim Bialik </Li> <Li> Melissa Rauch </Li> <Li> Kevin Sussman </Li> <Li> Laura Spencer </Li> </Ul> </Td> </Tr> <Tr> <Th> Theme music composer </Th> <Td> Barenaked Ladies </Td> </Tr> <Tr> <Th> Opening theme </Th> <Td> "Big Bang Theory Theme" </Td> </Tr> <Tr> <Th> Country of origin </Th> <Td> United States </Td> </Tr> <Tr> <Th> Original language (s) </Th> <Td> English </Td> </Tr> <Tr> <Th> No. of seasons </Th> <Td> 11 </Td> </Tr> <Tr> <Th> No. of episodes </Th> <Td> 236 (list of episodes) </Td> </Tr> <Tr> <Th_colspan="2"> Production </Th> </Tr> <Tr> <Th> Executive producer (s) </Th> <Td> Chuck Lorre Steven Molaro Bill Prady </Td> </Tr> <Tr> <Th> Producer (s) </Th> <Td> Faye Oshima Belyeu </Td> </Tr> <Tr> <Th> Editor (s) </Th> <Td> Peter Chakos </Td> </Tr> <Tr> <Th> Camera setup </Th> <Td> Multi-camera </Td> </Tr> <Tr> <Th> Running time </Th> <Td> 18--22 minutes </Td> </Tr> <Tr> <Th> Production company (s) </Th> <Td> Chuck Lorre Productions Warner Bros. Television </Td> </Tr> <Tr> <Th> Distributor </Th> <Td> Warner Bros. Television Distribution </Td> </Tr> <Tr> <Th_colspan="2"> Release </Th> </Tr> <Tr> <Th> Original network </Th> <Td> CBS </Td> </Tr> <Tr> <Th> Picture format </Th> <Td> HDTV 1080i </Td> </Tr> <Tr> <Th> Audio format </Th> <Td> Dolby Digital 5.1 </Td> </Tr> <Tr> <Th> Original release </Th> <Td> September 24, 2007 (2007 - 09 - 24)--present (present) </Td> </Tr> <Tr> <Th_colspan="2"> Chronology </Th> </Tr> <Tr> <Th> Related shows </Th> <Td> Young Sheldon </Td> </Tr> <Tr> <Th_colspan="2"> External links </Th> </Tr> <Tr> <Th> Website </Th> <Td> www.cbs.com/shows/big_bang_theory/ </Td> </Tr> </Table> <Tr> <Th_colspan="2"> The Big Bang Theory </Th> </Tr>

How many sessions of big bang theory are there