Step 1: Concept
Specialized serological tests are used to detect specific parasites or viruses in human serum.
Step 2: Meaning
The Sabin-Feldman dye test is a classic serological reference test.
Step 3: Analysis
This test measures IgG antibodies against Toxoplasma gondii. It works because the parasite's cell membrane is modified by the antibodies, preventing it from taking up methylene blue dye.
Step 4: Conclusion
The Sabin-Feldman dye test is the gold standard for diagnosing Toxoplasmosis.
Final Answer: (D)