You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Institute_of_technology

Context:
The Polytechnic institutes in Pakistan, offer a diploma spanning three years in different branches. Students are admitted to the diploma program based on their results in the 10th grade standardized exams. The main purpose of Polytechnic Institutes is to train people in various trades.

Question:
What are people being trained for, mainly, in Pakistan's polytechnic institutes?

trades