Okay, let's tackle this question. The question is about where serous demilunes are found. First, I need to recall what serous demilunes are. From my studies, I remember that they are structures in the salivary glands. Specifically, they're found in the submandibular gland. Wait, was it submandibular or sublingual? Hmm.

Wait, the submandibular gland has both serous and mucous cells. The serous demilunes are those crescent-shaped areas of serous cells surrounding the mucous acini. So in the submandibular gland, the acini are mixed, but the serous demilunes are a feature there. The sublingual gland, on the other hand, is mostly mucous with some serous cells, but maybe not demilunes. The parotid gland is mostly serous, so they don't have demilunes.

So the correct answer should be submandibular gland. Let me check the options again. The options A to D aren't listed here, but the correct answer is submandibular. The other options would be parotid, sublingual, maybe others like pancreas or sweat glands.

Wait, the question is about salivary glands. So parotid, submandibular, sublingual. The submandibular has mixed acini with serous demilunes. The sublingual is mostly mucous. The parotid is purely serous. So the answer is submandibular.

I need to make sure that serous demilunes are indeed in the submandibular. Also, demilunes are the crescent-shaped serous cells around mucous acini. So in the submandibular, which has both, the serous cells form demilunes around the mucous ones.

Therefore, the correct answer is submandibular gland.

**Core Concept**
Serous demilunes are crescent-shaped clusters of serous cells surrounding mucous acini in mixed salivary glands. They are a histological hallmark of the **submandibular gland**, which contains both serous and mucous acini.

**Why the Correct Answer is Right**
The submandibular gland is a mixed gland with serous demilunes formed by serous cells (called **serous demilunes**) encircling mucous acini. These demilunes are absent in the **parotid gland** (purely serous) and less prominent in the **sublingual gland** (predominantly mucous). The serous cells in demilunes produce **alpha-amylase**, contributing to saliva's enzymatic activity.

**Why Each Wrong Option is Incorrect**
**Option A:** If "Parotid gland" is listed, it is incorrect because the parotid is purely serous, with no mucous acini or demilunes.
**Option B:** If "Sublingual gland" is listed, it is incorrect because the sublingual gland is predominantly mucous, with minimal serous cells and no distinct demilunes.
**Option C:** If "Pancreas" is listed, it is incorrect because pancreatic acini are purely serous and lack mucous cells.

**Clinical Pearl / High

✓ Correct Answer: C. Mixed glands