This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
After surgery, there was 50ml bile output from abdominal drain 1st preoperative day. Management is 
Select and explain. 
A. Intra biliary stent, B. Immediate exploration, C. T-tube drainage, D. Observation
D: Observation
Answer: D: Observation 
Explanation: "A small amount of biliary drainage following cholecystectomy should cause no alarm because it usually dissapears within 1 or 2 days. However, excessive bile drainage through the wound or drain site, jaundice, sepsis or a combination of these events early in post-operative period should suggest a bile-duct injury, as should copious biliary drainage for more than few post-op days Ref: Blumga 5th edition Pg no : 524-525