Final answer:
The Lancefield Group F streptococcus is VP positive, PYR negative, sensitive to optochin and grows in 6.5% NaCl broth.
Step-by-step explanation:
Based on the information provided, the Lancefield Group F streptococcus can be identified as follows:
A) VP pos: This means that it is Voges-Proskauer positive, which is a test used to detect the presence of acetoin produced from glucose fermentation. It indicates the production of a certain type of acid.
B) PYR neg: This means that it is pyrrolidonyl arylamidase negative, indicating the absence of a specific enzyme.
C) Sensitive to optochin: This means that the streptococcus is rapidly destroyed by the addition of optochin, a compound used for identification.
D) Grows in 6.5% NaCl broth: This indicates that the streptococcus is able to grow in a high concentration of sodium chloride, which is a characteristic of certain groups.
In summary, the Lancefield Group F streptococcus is VP positive, PYR negative, sensitive to optochin, and grows in 6.5% NaCl broth.