 
 <prompt> Wetin do Bell wey be say e be like say e do something wey no too straight? Based on di last question, write one context wey go contain di answer. E fit be 1 - 20 sentences. Context: <response>: The question of priority for the variable resistance feature of the telephone bin raise by the examiner before e approve Bell's patent application. E tell Bell say im claim for the variable resistance feature dey also described for Gray's caveat. Bell point to a variable resistance device for Bell's previous application wey Bell describe as cup of mercury, no be water. Bell don file the mercury application for the patent office one year earlier on February 25, 1875, long before Elisha Gray describe the water device. In addition, Gray abandon im caveat, and because e no contest Bell's priority, the examiner approve Bell's patent on March 3, 1876. Gray don reinvent the variable resistance telephone, but Bell na the first wey write down the idea and the first wey test am for telephone. 