This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: Surgery
Clinical features suggestive of congenital trachea-esophagal fistula are all, except: 
Select and explain. 
A. Chocking and coughing, B. Regurgitation, C. Cyanosis, D. Fever
C: Cyanosis
Answer: C: Cyanosis 
Explanation: Ans. (c) CyanosisRef: Schwartz 10thEdition, Page 1608Clinical features of Infants with TEF:* Blind Fistulas presents with drooling of saliva, choking and; coughing after feeding* Abdominal distension due to air entry into abdomen via fistula*Atelectasis, chemical pneumonitis, respiratory infection* Inability to pass Ryles Tube (Coiling seen)* Cyanosis is not seen