A patellar reflex is an example of: A) Monosynaptic reflex B) Two-neuron reflex C) Three-neuron reflex D) Complex neuron reflex

The patellar reflex, also known as the knee-jerk reflex, is primarily a monosynaptic reflex. This means that it involves a direct connection between a sensory neuron and a motor neuron, with only one synapse in between. Here’s a breakdown of the options: A) **Monosynaptic reflex**: This is correct. The patellar reflex involves a single synapse between the sensory neuron that detects the stretch in the patellar tendon and the motor neuron that causes the quadriceps muscle to contract. B) **Two-neuron reflex**: This is also correct in a sense, as it involves two neurons (the sensory and motor neurons), but the term "monosynaptic" is more specific and accurate for this reflex. C) **Three-neuron reflex**: This typically refers to polysynaptic reflexes, which involve an additional interneuron. The patellar reflex does not involve interneurons. D) **Complex neuron reflex**: This is not a standard term used in neurophysiology and does not accurately describe the patellar reflex. Therefore, the best answer is: **A) Monosynaptic reflex**.