Analogy — “Cholera : Anthrax : Diphtheria”. Choose the statement that correctly classifies the set.

Difficulty: Easy

These are diseases caused by bacteria
These are plant pests
These are pathogens
These are infections of stomach
These are viral diseases

Correct Answer: These are diseases caused by bacteria

Explanation:

Introduction / Context:
The three names listed are human diseases. The task is to identify the common scientific classification that best describes all of them.

Given Data / Assumptions:

Cholera is caused by Vibrio cholerae (bacterium).
Anthrax is caused by Bacillus anthracis (bacterium).
Diphtheria is caused by Corynebacterium diphtheriae (bacterium).

Concept / Approach:
Confirm that all belong to the same etiological class (bacterial). Avoid broader/ambiguous choices.

Step-by-Step Solution:

Map each disease → causative agent type.All three are bacterial in origin → select the explicit statement.

Verification / Alternative check:
Cross-check that none of the three is viral/plant-related/limited to the stomach.

Why Other Options Are Wrong:

Plant pests — incorrect domain.Pathogens — too broad; the diseases are not pathogens themselves.Infections of stomach — diphtheria is respiratory; anthrax affects skin/lungs/GI variably.Viral diseases — wrong agent class.

Common Pitfalls:
Choosing an over-broad classification (“pathogens”) rather than the precise shared cause.

Analogy — “Cholera : Anthrax : Diphtheria”. Choose the statement that correctly classifies the set.

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