“Sulfur stinker” spoilage – In which product category is this spoilage (due to sulfide-producing anaerobes) uncommonly found?

Introduction / Context:
“Sulfur stinker” refers to H2S-linked spoilage, sometimes darkening contents and producing rotten-egg odors. It is associated with sulfide-producing anaerobes in canned goods.

Given Data / Assumptions:

• We compare low-acid, medium-acid, and high-acid canned foods.
• Organisms implicated (e.g., certain Clostridia) prefer higher pH.

Concept / Approach:
Sulfide spoilage organisms are inhibited by high acidity. Therefore, sulfur stinker incidents are rare in high-acid products (pH ≤ 3.7–4.0 typical for fruits and some beverages). They are more plausible in low-acid or, to a lesser extent, medium-acid foods.

Step-by-Step Solution:
Relate growth limits → sulfide producers are anaerobes needing pH conditions above those of high-acid foods. Map to categories → high-acid foods suppress clostridial growth and sulfide formation. Therefore, sulfur stinker spoilage is uncommonly found in high-acid foods.

Verification / Alternative check:
Historical canning defect records show sulfur stinker cases in low-acid vegetables; fruit acids markedly reduce incidence.

Why Other Options Are Wrong:
Low-acid and medium-acid are more permissive for anaerobic sporeformers; selecting “any of these” ignores pH constraints on growth.

Common Pitfalls:
Assuming all swollen cans in fruit juices are sulfur stinkers; yeast fermentations are more likely in acidic environments.

Final Answer:
High-acid foods.