Lactic Acid, Shown Below, Is Produced by Muscle Exercise and Can

Multiple Choice

Lactic acid, shown below, is produced by muscle exercise and can also be found in sour milk. Which of the following statements is true?

A) The racemic lactic acid produced by muscle exercise is identical to that found in sour milk.
B) The (−) -enantiomer is produced by muscle exercise and is also found in sour milk.
C) The (+) -enantiomer is produced by muscle exercise and is also found in sour milk.
D) Lactic acid produced by muscle exercise is the (+) -enantiomer, but that found in sour milk is the (−) -enantiomer.