This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory chain, Subject name: Biochemistry
Conversion of phenylacetic acid into phenol is an example of 
Select and explain. 
A. Oxidation, B. Reduction, C. Hydrolysis, D. Conjugation
A: Oxidation
Answer: A: Oxidation 
Explanation: Primary alcohols can be oxidised to make aldehydes, which can then be oxidised to carboxylic acids. Phenols and carboxylic acids can't be oxidised as they don't have a hydrogen atom on the carbon atom to which the OH group is attached.