Which of the following is not a byproduct of petroleum?

Petroleum refining produces byproducts such as paraffin wax, bitumen (asphalt), lubricating oil, petrol, diesel, kerosene, and LPG. Coke is not a byproduct of petroleum; it is a byproduct obtained from the destructive distillation of coal. Coal coke is used in metallurgy, especially in the extraction of iron. Therefore, among the given options, coke is the odd one out as it does not come from petroleum.