The call was short, just a few minutes, and the caller refused to say where she was calling from. But the question was clear: Would you support a soda tax in San Jose?

According to an audio recording obtained by the Mercury News, CCL Research conducted a poll of San Jose residents in early April to determine whether they have an appetite for a ballot measure that would tax sugary drinks sold in the city.

“Today I want to ask you a few questions about the potential future ballot initiative in San Jose,” the pollster can be heard saying in the recording, before asking whether the listener would support or oppose such a measure. “San Jose will vote to approve a tax of one cent per fluid ounce from the companies that distribute sugar-sweetened beverages, including sodas, sports drinks, sweetened teas and energy drinks. The tax will not include artificially sweetened or diet drinks…”

Such a tax, the pollster added, would provide exemptions for small businesses and add millions to the city’s bank account.

It was not immediately clear who funded the poll. CCL did not immediately return a request for information. A spokesman for Mayor Sam Liccardo said the survey did not originate in City Hall, and it does not appear to have started in Santa Clara County Supervisor Ken Yeager’s office, either. (The questions in the poll are San Jose-specific but Yeager has voiced support for such a tax in the past.)

The pollster asked the listener to respond to arguments for and against the proposal, including the idea that similar taxes have been a success in other cities, like Berkeley and Philadelphia, and, on the other side, the notion that improving children’s health is important but “taxing hardworking residents” is not the way to go.

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No such soda tax is currently slated to appear on the ballot in San Jose this year, although a number of local cities have approved such measures in recent years. In addition to Berkeley, which passed a soda tax in 2014, San Francisco, Oakland and Albany all passed soda taxes in 2016 despite fierce opposition from the soda industry.