Questions may be about infrastructure, prevalence of diseases common in primary healthcare or their consequences, workforce, effectiveness of programs and technologies... They should be about some quantity not easily available through a quick web search (I'll check that using Brazil as an example)
1,000What percentage of the population has sufficient income to afford, and transport infrastructure to reach, medical treatment for tuberculosis, should they contract it?
What percentage of the population is suffering from disabilities due to a malaria infection, and how much income do they lose as a result on average?
How rapidly could the HDI of a given nation rise to that of a typical European country if half the US military budget was dedicated to evidence based aid and investment there?