Indicate a text span in the passage about which an inquisitive question is asked. (note, don't answer the question).

Let me give you an example: Sentence: The Obama administration is developing additional screening protocols for airline passengers both overseas and in the United States to control infectious diseases such as Ebola, President Barack Obama said Monday .<sep>Question: What was the duration of the Obama administration?
The answer to this example can be: Obama administration
Here is why: It guesses the right span of the sentence where the question is from.

OK. solve this:
Sentence: Weatherford International Inc . said it canceled plans for a preferred - stock swap but may resume payment of dividends on the stock , and added that it expects to publicly offer about 10 million common shares .<sep>Question: Does this stock-swap mean swapping between two companies?
Answer:
preferred - stock swap