This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Dental
Samitz sign in nails is characteristically seen in 
Select and explain. 
A. Tuberous scelrosis, B. Lupus erythematosus, C. Dermatomyositis, D. Neurofibromatosis
C: Dermatomyositis
Answer: C: Dermatomyositis 
Explanation: Summit sign -Dystrophic and ragged cuticle in nails. seen in dermatomyositis. The other signs seen are: Shawl sign:- violaceous erythema extending from dorsolateral aspect of hands, forearms, and arms to shoulders and neck. Gottron's papules- violaceous papules on the bony prominences of the hands. Gottron's sign- presence of symmetrical macular erythema violaceous erythema on the dorsal aspect of interphalangeal joints of the hands, olecranon process, patella and medial malleoli. Heliotrope rash- periorbital confluent macular violaceous erythema. Periungual telangiectasia Calcinosis cutis Ref Harrison 20th edition pg 1278