 
 <prompt> 500 plus 50 plus just one more na wetin? Given di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Medical detection dogs fit detect diseases by sniff person directly or samples of urine or other specimens. Dogs fit detect odour for one part per trillion, as their brain olfactory cortex big pass humans own by 40 times. Dogs fit get as many as 300 million odour receptors for their nose, while humans fit get only 5 million. Each dog dey trained specifically for the detection of single disease from blood glucose level wey fit show diabetes to cancer. To train cancer dog go need 6 months. One Labrador Retriever wey dem call Daisy don detect 551 cancer patients with accuracy of 93 percent and she don receive Blue Cross Medal for her life-saving skills. 