This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamin, Subject name: Pharmacology
[{'content': 'Antivitamin of biotin- \nSelect and explain. \nA. Vitamin B6, B. Vitamin K, C. Avidin, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) AvidinKD Tripathi 6th Ed. / 876BIOTIN* Biotin is a sulfur containing organic acid found in egg yolk, liver, nuts and many other articles of food.* It is well absorbed from intestine and excreted mainly unchanged in urine.* Avidin, a heat labile protein in egg white, binds and prevents the absorption of biotin.', 'role': 'assistant'}]