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: Surgery
In retrosternal goiter, most common presenting feature is- 
Select and explain. 
A. Dysphagia, B. Stridor, C. Dyspnoea, D. Sup. vena caval syndrome
C: Dyspnoea
Answer: C: Dyspnoea 
Explanation: None