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
The following can be done in obstructive jaundice -a) Vitamin K injectionsb) Vitamin C injectionsc) Dehydration therapyd) External drainage 
Select and explain. 
A. b, B. ad, C. ac, D. ab
B: ad
Answer: B: ad 
Explanation: None