The correct answer is option 4: Argemone oil. Argemone oil is known to cause dropsy, which is a condition characterized by the abnormal accumulation of fluid in the body`s tissues. Dropsy can lead to swelling, particularly in the limbs and abdomen, and can be a symptom of various underlying health issues. It is important to note that argemone oil is not commonly used for cooking purposes, and its consumption is typically accidental or due to adulteration of food products. Groundnut oil, coconut oil, and sunflower oil are commonly used cooking oils and do not typically cause dropsy.