Portuguese is the official language of all the following countries except:

Portuguese is indeed the official language in Mozambique, Brazil, and Angola, making these countries part of the Portuguese-speaking world. Mozambique and Angola are in Africa and were former colonies of Portugal, where Portuguese remains the primary means of communication in government, education, and media. Brazil, as the largest country in South America, has Portuguese as its sole official language, stemming from colonization in the 16th century.

Peru, however, does not have Portuguese as its official language. Instead, the official language of Peru is Spanish, with various indigenous languages recognized in regional areas. While Portuguese may be spoken by some communities due to migration and cultural exchange, it does not hold the status of an official language in the country. Thus, the correct answer highlights that Peru is the exception among the options provided.