Quality Control Is Performed to Test the Validity of Catalase

Multiple Choice

Quality control is performed to test the validity of catalase production at 68°C.M.fortuitum and M.tuberculosis are used,which yield a positive and negative reaction,respectively.Which one of the following statements explains this discrepancy?

A) Both organisms were most likely incubated at the wrong temperature.
B) Both organisms were most likely incubated on the wrong media before testing.
C) The catalase reagent is most likely expired.
D) No discrepancy is present.M.fortuitum is catalase-positive and M.tuberculosis is catalase-negative at 68°C.