Use reasoning to lead to the answer of the following question:
The term knee-jerk was recorded by Sir Michael Foster in his Textbook of physiology in 1877: "Striking the tendon below the patella gives rise to a sudden extension of the leg, known as the knee-jerk."\n\nAnswer this question: state the type of stimulus that would cause a knee jerk reflex to occur?

Striking the tendon below the patella
This is the relevant information: The term knee-jerk was recorded by Sir Michael Foster in his Textbook of physiology in 1877: "Striking the tendon below the patella gives rise to a sudden extension of the leg, known as the knee-jerk.

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So, the final answer is Striking the tendon below the patella