Final answer:
The biggest city in a country is sometimes the capital in Africa.
Step-by-step explanation:
In Africa, the statement 'In Africa, the biggest city in a country is sometimes the capital of that country' is the most accurate statement. While many capitals in Africa are also the largest cities in their respective countries, there are exceptions to this rule. For example, in South Africa, the largest city is Johannesburg, but the capital is Pretoria. Another example is Nigeria, where the largest city is Lagos, but the capital is Abuja.
It is important to note that the size and importance of a city can vary based on factors such as historical, political, and economic considerations. Therefore, it cannot be generalized that the biggest city in a country is always the capital.