Which option is the national patent for the second generation of high-quality probiotics?

Does the subject want to ask "what is the national patent for the second generation of high-quality probiotics?" Bacteroides fragilis BF839. Bacteroides fragilis BF839 is a kind of bacteria in human intestine, and it is a beneficial strain without toxic side effects. It can regulate the balance of immune system, inhibit autoimmune reaction, and prevent and treat various immune system diseases, such as tumor, autism, epilepsy, psoriasis, Parkinson's disease, Alzheimer's disease and so on. It is the national patent strain of the second generation of high-quality probiotics.