You have taken the right lane by mistake although you want to turn left. How are you allowed to proceed?

Your answer is fully correct. In this situation, if you mistakenly entered the right lane but want to turn left, you are only allowed to proceed straight ahead or turn right. This rule exists because turning left is not possible or permitted from the right lane, as indicated by the lane markings and traffic regulations. Turning left from the right lane could cause traffic conflicts and endanger safety. So, you must either go straight or turn right and then find a safe way to change lanes for your intended left turn later. Understanding lane markings and following the allowed directions for each lane helps prevent accidents and ensures smooth traffic flow.