**Core Concept**
The sensory supply of the face is primarily provided by the **trigeminal nerve**, which is the fifth cranial nerve. This nerve has three main divisions: the **ophthalmic**, **maxillary**, and **mandibular** branches. The **maxillary division** is responsible for the sensory innervation of the middle face, including the upper part of the cheek.

**Why the Correct Answer is Right**
The upper part of the cheek receives its sensory supply from the **maxillary division of the trigeminal nerve**. This division provides sensation to the skin of the face between the lower eyelid and the upper lip, as well as to the nasal mucosa and the palate. The **maxillary nerve** exits the cranium through the **foramen rotundum** and provides sensory branches to the face.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not specified, but typically, the ophthalmic division supplies the upper face.
**Option B:** Incorrect because the mandibular division primarily supplies the lower face.
**Option D:** Incorrect because it is not the correct division for the upper cheek.

**Clinical Pearl / High-Yield Fact**
Remember that the trigeminal nerve has a wide distribution, and its **maxillary division** is crucial for the sensory supply of the mid-face region, including the upper cheek. This knowledge is essential for diagnosing and managing facial sensory abnormalities.

**Correct Answer:** B. Maxillary division of trigeminal nerve