Concept:
In forensic biology, identifying biological fluids such as blood, semen, and saliva is important for criminal investigations. Various biochemical tests are used to detect these fluids based on specific enzymes or chemical reactions.
Step 1: Understanding semen detection in forensic science.
Semen contains a high concentration of the enzyme acid phosphatase, which originates from the prostate gland. This enzyme is commonly used as an indicator for the presence of semen in forensic samples.
Step 2: Identifying the appropriate test.
The Acid Phosphatase Test is used as a presumptive test for semen detection. When the reagent reacts with acid phosphatase, it produces a rapid color change, indicating the possible presence of semen.
Thus, the correct answer is:
\[
\boxed{\text{Acid Phosphatase Test}}
\]