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
Which of the following is better indicator of need for tranfusion - 
Select and explain. 
A. Urine output, B. Haematorcrit, C. Colour of skin, D. Clinical examination
B: Haematorcrit
Answer: B: Haematorcrit 
Explanation: Better indicator of need for transfusion

In case of chronic anemia → Haematocrit
In case of trauma → Clinical examination