Which of the following did NOT contribute to increased life expectancy in the early 20ᵗʰ century?

Question

Quizplus · Accepted Answer

While having more doctors in metropolitan areas may have improved health outcomes for those who had access to them, it did not contribute significantly to increased life expectancy on a population level. The other three factors listed (improved sanitation, antibiotics, and vaccinations) had major impacts on reducing mortality rates and increasing life expectancy during the early 20th century.

Which of the Following Did NOT Contribute to Increased Life