I want to know the answer to the following question:
Which Secretary of State did President Truman hold discussions about how the US would respond to the invasion of South Korea?
All the background I'm provided with is that "Truman and Acheson discussed a U.S. invasion response and agreed that the United States was obligated to act, paralleling the North Korean invasion with Adolf Hitler's aggressions in the 1930s, with the conclusion being that the mistake of appeasement must not be repeated.". Is that enough to answer the question?