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
Following is true about bronchial carcinoids. 
Select and explain. 
A. Highly radiosensitive, B. Metastasis common, C. Carcinoid syndrome does not manifest, D. Commonly arise from terminal bronchioles
C: Carcinoid syndrome does not manifest
Answer: C: Carcinoid syndrome does not manifest 
Explanation: Carcinoid syndrome is associated with 10% of bronchial carcinoids only.
Most bronchial carcinoids.
	
Do not have secretory activity.
Do not metastasize to distant.
Follow a relatively benign course.