Why do you want to say which five major problems have been solved? If I want to say this, I don't think there should be only five big questions, but if I want to say five answers, I think it is, life and old age. Sickness, death, disability. ! ! These five words can be said to cover five major problems in life. Education, financial management, pension issues, major diseases, accidents, medical care and other protection are also for those five words.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.