This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Skin
Which of the following condition is associated with Gottron's sign? 
Select and explain. 
A. Dermatomyositis, B. SLE, C. Scleroderma, D. MCTD
A: Dermatomyositis
Answer: A: Dermatomyositis 
Explanation: Gottron's sign is a characteristic feature of dermatomyosistis. It is a violaceous, erythematous, symmetrical rash that occur on the extensor surface of the metacarpophalangeal and interphalangeal joints. Similar lesions can also occur over the elbow and knees. Other features of dermatomyositis are -heliotrope rash which is a reddish purple rash that occur on the eyelids which is associated with swelling of the eyelid. -Periungal erythema -abnormal nail bed capillary loops and -cracking of the skin of the tips of fingers are also seen in dermatomyositis.