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: Social & Preventive Medicine
[{'content': 'Which one of the following describes the flavouring substance asafoetida (Hing) ? \nSelect and explain. \nA. Dried leaf extract, B. Exudate from chopped roots, C. Pith of stem boiled and dried, D. Dried and hardened paste of fruit', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]