The doc here: http://www.iqfeed.net/dev/api/docs/OptionChainsviaTCPIP.cfm
indicates that the response to any of the requests for option chains will have "a field containing the letters LC". We expect to see LC as the first field unless a RequestID is specified, and in that case LC would be the second token.
Nonetheless in response to the request, LC is nowhere to be found in the response.
I don't care if LC is there or not, but I just want to know that it will never be there. Will it?