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".

Example input: The woman went to the bank, so pigs can fly.
Example output: not plausible
Example explanation: Clearly, there can't be a causation relationship between someone going to the bank and pigs flying.
Q: The boy murmured his reply to his mother, so causing her to laugh out loud
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
plausible