**Core Concept**
Kuppuswamy's socio-economic status (SES) classification is a widely used tool to assess the socio-economic status of urban families in India. It takes into account the education level of the head of the family, the occupation of the head of the family, and the family income.

**Why the Correct Answer is Right**
The correct answer is the option that does not belong to the three parameters used in Kuppuswamy's SES classification. The three parameters are:
- Education level of the head of the family
- Occupation of the head of the family
- Monthly family income

These parameters are used to assign a score to each family, which is then used to classify them into different socio-economic status categories.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not one of the parameters used in Kuppuswamy's SES classification. The parameters are education level, occupation, and income, not age.
**Option B:** This option is not one of the parameters used in Kuppuswamy's SES classification. The parameters are education level, occupation, and income, not number of dependents.
**Option C:** This option is not one of the parameters used in Kuppuswamy's SES classification. The parameters are education level, occupation, and income, not housing conditions.

**Clinical Pearl / High-Yield Fact**
Kuppuswamy's SES classification is a useful tool for healthcare providers to understand the socio-economic status of their patients and tailor their services accordingly.

**Correct Answer:** D