Explanation:

The correct answer is option 'D', Housewife.

Uniform:
A uniform is a specific type of clothing worn by individuals for identification or to signify their membership in a particular group or organization. Uniforms are often worn by professionals in various fields to create a sense of unity, professionalism, and easily identifiable status.

Doctor:
Doctors typically wear a uniform in the form of a white lab coat or scrubs when they are working in a hospital or clinic. The lab coat or scrubs help to establish a professional image and create a sense of trust and confidence in patients. It also helps to differentiate doctors from other healthcare professionals.

Postman:
Postmen often wear a uniform that consists of a shirt or jacket with the logo or emblem of the postal service, along with matching pants and a hat. The uniform helps to identify them as postal workers and allows them to be easily recognized by the public.

Policeman:
Police officers wear a distinct uniform that is designed to symbolize their authority and to make them easily identifiable in order to maintain law and order. The uniform typically includes a shirt or jacket with the police department's badge, a hat or cap, and sometimes additional accessories such as a belt and a badge.

Housewife:
A housewife, on the other hand, does not have a specific uniform that they are required to wear. They have the freedom to wear whatever clothing they feel comfortable in while performing their household duties. The choice of clothing for a housewife can vary depending on personal preference, cultural norms, and the tasks they are engaged in.

Conclusion:
In conclusion, among the given options, the housewife is the one who does not wear a specific uniform. While doctors, postmen, and policemen have distinct uniforms that help to identify their profession, a housewife does not have any prescribed uniform and can wear any clothing of their choice while performing their household duties.