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: Anaesthesia
[{'content': 'One of the following is true about the physical state of thiopentone \nSelect and explain. \nA. Colorless, B. Pale yellow color, C. Green color, D. Acidic solution', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Thiopentone is available as yellow amorphous powder.', 'role': 'assistant'}]