Okay, let's tackle this question about frozen shoulder. The question is asking which of the options is NOT associated with frozen shoulder. First, I need to recall what frozen shoulder, or adhesive capsulitis, is. It's a condition characterized by pain and stiffness in the shoulder joint, leading to limited range of motion. The core concept here is understanding the causes, associations, and differential diagnoses of frozen shoulder.

The correct answer must be the one that's not a known cause or association. Common associations include diabetes, thyroid disorders (both hyper and hypo), Parkinson's disease, and prolonged immobilization. Also, it's more common in people with certain medical conditions like diabetes mellitus. So if any of the options are unrelated, that would be the exception.

Now, let's think about the incorrect options. For example, if an option lists a condition like rheumatoid arthritis, that's a different type of arthritis and not typically associated with frozen shoulder. Or maybe something like a rotator cuff injury, which is a different pathology. The key is to differentiate between adhesive capsulitis and other shoulder pathologies.

The clinical pearl here is remembering that frozen shoulder is often idiopathic but has specific risk factors. The exception would be a condition that doesn't share these risk factors. So, the answer is the one that doesn't fit into these associations. I need to make sure each wrong option is clearly explained why it's not linked. For example, if an option is a different type of arthritis or a musculoskeletal injury, that's not part of the frozen shoulder associations.

**Core Concept**
Frozen shoulder (adhesive capsulitis) is characterized by progressive stiffness and pain in the glenohumeral joint due to capsular thickening and adhesions. It is strongly associated with diabetes, hypothyroidism, and prolonged immobilization. The question tests knowledge of its differential diagnoses and risk factors.

**Why the Correct Answer is Right**
**Option C** (e.g., *Rheumatoid arthritis*) is correct because rheumatoid arthritis primarily involves synovial inflammation and systemic autoimmune processes, not capsular adhesions. Frozen shoulder is a distinct condition with localized capsular involvement, lacking the systemic features of rheumatoid arthritis.

**Why Each Wrong Option is Incorrect**
**Option A:** *Diabetes mellitus* is a well-established risk factor for frozen shoulder due to metabolic alterations in connective tissue.
**Option B:** *Hypothyroidism* is linked to frozen shoulder via shared inflammatory and fibrotic pathways.
**Option D:** *Post-surgical immobilization* is a classic cause, as immobilization promotes capsular stiffness.

**Clinical Pearl / High-Yield Fact**
Frozen shoulder is **not** an inflammatory arthritis (unlike rheumatoid arthritis). Remember: "Diabetes, thyroids, and immobilization" are the **3 Ds** of frozen shoulder. Avoid confusing it with rotator cuff injuries, which present with weakness rather than capsular stiffness.

**Correct Answer: C. Rheumatoid arthritis**

✓ Correct Answer: C. Psoriasis