Classification – Odd one out (diseases vs health state): Which item does not belong: Cholera, AIDS, Cancer, Health?

Introduction / Context:
The set mixes medical terms. Three are names of illnesses or disease conditions. One is a positive state of well-being. The task is to choose the member that is not a disease.

Given Data / Assumptions:

• Cholera — an acute infectious disease caused by Vibrio cholerae.
• AIDS — Acquired Immunodeficiency Syndrome, a condition caused by HIV.
• Cancer — a group of diseases involving abnormal cell growth with potential to invade or spread.
• Health — a state of complete physical, mental, and social well-being (not a disease).

Concept / Approach:
Map each item to its medical category: “disease/condition” versus “state.” Cholera, AIDS, and Cancer clearly denote illnesses. Health is the absence (or good management) of disease and is categorically different from the rest. Therefore, Health is the odd one out.

Step-by-Step Solution:
1) Identify disease names: Cholera, AIDS, Cancer.2) Identify non-disease state: Health.3) Select Health as the unique outlier.

Verification / Alternative check:
Attempt to frame each in “diagnosed with _____.” This works for Cholera/AIDS/Cancer but not for “diagnosed with health,” confirming the categorical mismatch.

Why Other Options Are Wrong:
They are all illnesses and thus belong to the same group.

Common Pitfalls:
Overthinking causes/agents (bacterial/viral/non-infectious). The exam expects the simpler disease vs non-disease distinction.

Final Answer:
Health