Explanation:

- Apartheid was a policy and system of racial segregation and discrimination enforced by the government of South Africa between 1948 and 1994.

- It is not related to being an international organization of peace, so option 1 is incorrect.

- It is not a medical term; option 2 is also incorrect.

- Apartheid was not a trade charter, so option 3 is incorrect.

Correct Answer: Option 4, A policy of racial segregation.

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