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: Biochemistry
[{'content': 'Hydrogenation of fatty acid is ? \nSelect and explain. \nA. Hydrolysis by Alkali, B. Auto-oxidation of PUFA, C. Addition of hydrogen to unsaturated fatty acid, D. Addition of hydrogen to saturated fatty acid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., Addition of hydrogen to unsaturated fatty acidAddition of hydrogen atoms to unsaturated fatty acid refers to hydrogenation. It reduces the number of double bonds in the unsaturated fats.Hydrogenation of unsaturated fats in the presence of a catalyst (nickle) in known as "hardening", because it conves liquid vegetable oils into solid fats e.g. margarines, vegetable ghee, etc.', 'role': 'assistant'}]