**Question:** A 35 year old lady complains dysphagia, Raynaud's phenomenon, sclerodactyly. Investigations show antinuclear antibody. The likely diagnosis is -

A. Systemic sclerosis
B. Sjögren's syndrome
C. Scleroderma
D. Systemic lupus erythematosus

**Correct Answer:** **Systemic sclerosis (C)**

**Core Concept:**
Systemic sclerosis (SSc), also known as scleroderma, is a chronic autoimmune disorder characterized by excessive collagen deposition in the dermis and internal organs leading to fibrosis, vasculopathy, and autoimmune activation. Dysphagia, Raynaud's phenomenon, and sclerodactyly are common clinical manifestations. Antinuclear antibody (ANA) is a non-specific marker found in various autoimmune disorders, but its presence in combination with Raynaud's phenomenon and sclerodactyly strongly suggests SSc.

**Why the Correct Answer is Right:**
Systemic sclerosis is the correct answer because it is the most likely diagnosis given the patient's symptoms and clinical findings. The presence of dysphagia, Raynaud's phenomenon, and sclerodactyly are indicative of tissue fibrosis, a hallmark feature of SSc. Additionally, antinuclear antibody is a non-specific marker found in various autoimmune disorders. However, its association with Raynaud's phenomenon and sclerodactyly strongly suggests SSc.

**Why Each Wrong Option is Incorrect:**

A. Systemic lupus erythematosus (SLE): Although SLE can cause Raynaud's phenomenon, it typically presents with a more widespread autoimmune manifestation and renal involvement.

B. Sjögren's syndrome: This disorder primarily affects the salivary and lacrimal glands, leading to dryness, rather than causing Raynaud's phenomenon and skin changes.

C. Systemic sclerosis: The presence of Raynaud's phenomenon and sclerodactyly further supports the diagnosis of SSc. However, the correct answer is not SSc (option C) but rather SSc (option A).

D. Systemic lupus erythematosus: Although SLE can cause Raynaud's phenomenon, it typically presents with a more widespread autoimmune manifestation and renal involvement.

**Clinical Pearl:**
SSc is a complex disease characterized by fibrosis of the skin and internal organs, leading to Raynaud's phenomenon, sclerodactyly, and other clinical features. The association of Raynaud's phenomenon and sclerodactyly strongly supports the diagnosis of SSc. However, the correct answer is not option C (Systemic sclerosis) but option D (Systemic lupus erythematosus). Systemic lupus erythematosus (SLE) is a multisystem autoimmune disorder that can cause Raynaud's phenomenon, but it typically presents with a more widespread autoimmune manifestation and renal involvement.

In summary, while SSc