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
Type of lung carcinoma producing superior vena cava syndrome - 
Select and explain. 
A. Squamous cell carcinoma, B. Adenocarcinoma, C. Small cell carcinoma, D. Anaplastic carcinoma
C: Small cell carcinoma
Answer: C: Small cell carcinoma 
Explanation: None