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: Anaesthesia
Which of the following is predictor of difficult airway 
Select and explain. 
A. Systemic lupus, B. Systemic sclerosis, C. Sarcoidosis, D. Cystic fibrosis
B: Systemic sclerosis
Answer: B: Systemic sclerosis 
Explanation: Systemic sclerosis is associated with difficult airway.