Write an inquisitive question about a specific text span in a given sentence such that the answer is not in the text.

Example input: Sentence: The Obama administration is developing additional screening protocols for airline passengers both overseas and in the United States to control infectious diseases such as Ebola, President Barack Obama said Monday .<sep>Span: Obama administration
Example output: What was the duration of the Obama administration?
Example explanation: It is an inquisitive question based on the specific span of the sentence.
Q: Sentence: " Unfortunately , people are trading on the fact these harnesses and vests have become distinguishing marks of service dogs , so now you find unscrupulous businesses who sell these things to people who want to take their dogs into the store or restaurant or in the passenger cabin of the plane , " said Paul Mundell , national director of canine programs for CCI .<sep>Span: businesses who sell these things
A:
How many businesses are selling harnesses and vests for service dogs?