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: Medicine
A 35 year old lady complains dysphagia, Raynaud's phenomenon, sclerodactyly. Investigations show antinuclear antibody. The likely diagnosis is - 
Select and explain. 
A. Systemic lupus erythematosis, B. Systemic sclerosis, C. Mixed connective tissue disorder, D. Rheumatoid arthritis
B: Systemic sclerosis
Answer: B: Systemic sclerosis 
Explanation: None