Okay, let's tackle this question about the gluteus maximus. The question is asking which nerve supplies the gluteus maximus. First, I need to recall the innervation of the gluteal muscles.

The gluteal muscles include gluteus maximus, medius, and minimus. Each has different nerve supplies. I remember that the gluteus medius and minimus are supplied by the superior gluteal nerve. The gluteus maximus, on the other hand, is innervated by the inferior gluteal nerve. Wait, is that right? Let me double-check. Yes, the inferior gluteal nerve comes from the sacral plexus, specifically L5, S1, S2. The superior gluteal nerve (L4, L5, S1) supplies the medius and minimus. So the correct answer here should be the inferior gluteal nerve.

Now, the options are A, B, C, D, but they're not labeled. However, the correct answer is the inferior gluteal nerve. The other options might be other nerves like the sciatic nerve, pudendal nerve, or superior gluteal nerve. The sciatic nerve is a major nerve in the lower limb but doesn't directly supply the gluteus maximus. The pudendal nerve is more involved in the perineum. The superior gluteal nerve, as mentioned, supplies the medius and minimus, not the maximus. So the key point here is distinguishing between the superior and inferior gluteal nerves and their respective muscles. A clinical pearl is that injuries to the inferior gluteal nerve can lead to weakness in extending the hip, affecting activities like climbing stairs or running.

**Core Concept**
Gluteus maximus is innervated by the **inferior gluteal nerve**, a major branch of the sacral plexus (L5, S1, S2). This nerve supplies the largest gluteal muscle, which is critical for hip extension and external rotation.

**Why the Correct Answer is Right**
The **inferior gluteal nerve** (L5, S1, S2) innervates the gluteus maximus. It exits the pelvis via the greater sciatic foramen, inferior to the piriformis, and enters the gluteus maximus muscle. This muscle is essential for activities like climbing stairs and maintaining upright posture by extending the hip against gravity.

**Why Each Wrong Option is Incorrect**
**Option A:** *Superior gluteal nerve*—Supplies gluteus medius and minimus, not maximus.
**Option B:** *Sciatic nerve*—Composed of tibial and common peroneal divisions; innervates hamstrings and lower leg muscles, not gluteus maximus.
**Option C:** *Pudendal nerve*—Supplies perineal structures, not gluteal muscles.

**Clinical Pearl / High-Yield Fact**
Remember: **"Superior for medius, inferior for maximus."** The superior gluteal nerve (L4–S1) innervates gluteus medius and minimus, while the inferior gluteal nerve (L5–S2) targets gluteus maximus. Injury to the inferior

✓ Correct Answer: B. Inferior gluteal nerve