You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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 woman went to the bank, so pigs can fly.
Solution: not plausible
Why? Clearly, there can't be a causation relationship between someone going to the bank and pigs flying.

New input: The boy murmured his reply to his mother, so he must have done something right
Solution:
not plausible