**Core Concept:** The Tober-Ayer test is a clinical maneuver used to differentiate between lumbar and sacral root lesions. It involves eliciting a straight-leg raise (SLR) test and comparing the angle of pain reproduction with both legs. A positive test occurs when the angle of pain reproduction is greater on one side compared to the other.

**Why the Correct Answer is Right:** A positive Tober-Ayer test suggests a lumbar root lesion because the SLR test is more sensitive at detecting lumbar root lesions than sacral lesions. The angle of pain reproduction is larger in lumbar lesions due to the greater range of motion in the lumbar spine compared to the sacrum.

**Why Each Wrong Option is Incorrect:**

A. **Tober Ayer test is positive in sacral root lesions (wrong)**: This option is incorrect because a positive test indicates a lumbar root lesion, not a sacral one.

B. **Tober Ayer test is positive in lumbar root lesions (wrong)**: This option is also incorrect as a positive test indicates a lumbar root lesion, not a lumbar one.

C. **Tober Ayer test is positive in both lumbar and sacral root lesions (wrong)**: Although the test can be positive in both types of lesions, option C is incorrect because the test is more sensitive in detecting lumbar root lesions, as explained above.

D. **Tober Ayer test is positive in cases of spinal stenosis (wrong)**: The Tober-Ayer test is a specific test for lumbar root lesions and not related to spinal stenosis.

**Clinical Pearl:** A positive Tober-Ayer test can help guide the diagnosis of a lumbar root lesion and narrows down the differential diagnosis, allowing for further targeted testing and treatment.