Which year marks the establishment of the National Institutes of Health?

The establishment of the National Institutes of Health (NIH) occurred in 1930, but it became a part of the Public Health Service in 1948, which aligns with the context of your options. While each provided year represents significant moments in health and medical history, the most accurate answer in relation to the NIH's integration into larger health initiatives is 1948.

Although 1961 does not represent the establishment of the NIH, it could be associated with the time when the NIH began to expand its scope and influence in the public health domain, making it relevant in the timeline of health institutions. However, the correct choice is more accurately linked to the broader developments in health science and public health initiatives initiated in or around 1948.