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: Pathology
[{'content': 'Mask-like appearance of face with narrowing of aperture and rigidity of the mucosa is characteristic of: \nSelect and explain. \nA. Progressive systemic sclerosis, B. Tetanus, C. Multiple sclerosis, D. OsteomaLacia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]