A drop of 10% deoxycholate was placed on an area of growth as shown in the image. This test is often used to differentiate S. pneumoniae from viridans streptococci. What is the name of this test?

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A drop of 10% deoxycholate was placed on an area of growth as shown in the image. This test is often used to differentiate S. pneumoniae from viridans streptococci. What is the name of this test?

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