 
 <prompt> Wetin be di most common way wey any kain manufacturer fit use to get market exclusivity? Based on di question wey dey before, write something wey get di answer. E fit be 1 - 20 sentences. Context: <response>: Dey get special rules for some rare diseases ("orphan diseases") for different drug regulatory territories. For example, diseases wey get less than 200,000 patients for United States, or larger populations for some cases dey follow Orphan Drug Act. Because medical research and development of drugs to treat these kind diseases no dey bring money, companies wey do am dey get tax reductions, fee waivers, and market exclusivity on top that drug for small time (seven years), no matter whether the drug get patents or not. 