In this question, we are asked to select the option that is opposite in meaning to the underlined word "dissident". A dissident is someone who disagrees or opposes the current government or political system. Let`s analyze each option to determine the correct answer.

Option 1: "Agitator" is not the opposite of "dissident". An agitator is someone who actively promotes or provokes trouble or unrest, which is similar to a dissident.

Option 2: "Rebel" is also not the opposite of "dissident". A rebel is someone who resists or fights against authority, which is similar to a dissident.

Option 3: "Conformist" is the opposite of "dissident". A conformist is someone who complies with the established rules or norms and doesn`t question or oppose them. This is the correct answer.

Option 4: "Revolutionary" is not the opposite of "dissident". A revolutionary is someone who wants to bring about significant change or overthrow the existing system, which can sometimes align with the actions of a dissident.

In conclusion, the correct answer is option 3, "conformist", as it is the opposite in meaning to "diss