<prompt> Antivitamin of biotin-Vitamin B6Vitamin KAvidinNone  <response>: 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. 