Detailed Instructions: This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.
Q: The prevalence of HIV-infection among the adult population is 1.8%. Only 20% of infected pregnant women receive anti retroviral coverage to prevent transmission to newborns.
A:
What infection has a very small prevalence in Guinea-Bissau?