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 man was lost, so he refused to do so
not plausible

The baby pulled the mother's hair, so the baby burped
not plausible

The tenant misplaced his keys to his apartment, so his landlord repaired the door

plausible