In this task, you will be given two sentences separated by ", so". You should decide whether the first sentence can be the cause of the second sentence. If you can see a possible causation, answer with "plausible", otherwise answer with "not plausible".

The pond froze over for the winter, so we had to clean it
not plausible

The elderly woman suffered a stroke, so causing her to lose consciousness
plausible

The doctor x-rayed the patient's arm, so he had to start all over again

not plausible