Question

Match List I with List II
List I (Disease Condition):
A. Typhoid
B. Antibiotics in milk
C. Scarlet fever
D. Pasteurization
List II (Test):
i. Delvo test
ii. Dick test
iii. Phosphatase test
iv. Widal test
Choose the correct answer from the options given below:

• A. A – ii, B – i, C – iii, D – iv
• B. A – iv, B – iii, C – ii, D – i
• C. A – iii, B – i, C – iv, D – ii
• D. A – iv, B – i, C – ii, D – iii

Hint:

To solve matching questions efficiently, pair known standards first: pasteurization is always verified by the phosphatase test, and antibiotic residues are screened via the Delvo test.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Quality control and disease diagnostics in dairy science require matching specific conditions or pathogens with their validated assays.

Step 2: Detailed Explanation:
Let us analyze each pair individually:
A. Typhoid: This systemic illness is caused by Salmonella enterica serovar Typhi.
The classic serological diagnostic method used to detect antibodies against the O and H antigens of this pathogen is the Widal test (iv).
B. Antibiotics in milk: Antibiotic residues in raw milk can inhibit starter cultures and cause allergic reactions.
The standard microbial inhibition assay used to screen for these residues is the Delvo test (i), which uses the sensitive indicator bacterium Geobacillus stearothermophilus.
C. Scarlet fever: This infectious disease is caused by erythrogenic toxin-producing strains of Streptococcus pyogenes.
The skin test used to evaluate susceptibility or immunity to this erythrogenic toxin is the Dick test (ii).
D. Pasteurization: The efficiency of pasteurization is monitored by verifying the inactivation of alkaline phosphatase.
Because this enzyme is slightly more heat-resistant than vegetative pathogens, its inactivation is verified using the Phosphatase test (iii).

Step 3: Final Answer:
Matching these pairs yields the sequence A – iv, B – i, C – ii, D – iii.