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: Dental
A 40-year-old woman presented with 8-month history of erythema and swelling of the periorbital region & papules & plaques an the dorsolateral aspect of forearms & knuckles with ragged cuticles. There was no muscle weakness. The most likely diagnosis is – 
Select and explain. 
A. SLE, B. Dermatomyositis, C. Systemic sclerosis, D. Mixed connective tissue disorder
B: Dermatomyositis
Answer: B: Dermatomyositis 
Explanation: This woman has:-


Erythema and swelling to periorbital region → Heliotrope erythema.
Papules and plaques on the dorsolateral aspect of knuckle & forearms → Gottron's papule.


Diagnosis is Dermatomyositis.