Leaders of the market for these remedies, like Beijing Tongrentang Co Ltd, have products with snakeskin, dried toad, centipede, scorpion and dandelion to treat swelling, and others with oyster, ginseng and black-bone chicken for menstrual pains.
Refer to the input text as context and select the correct relationship between 'Tongrentang' and 'Beijing' from the available options.
Options: stock exchange, developer, headquarters location, parent organization