Instructions: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: A 76-year-old woman surgically treated for a cataract in her left eye two years before without complications. He says that for the last few months he has had the sensation that the cataract has been reproduced. Point out the most likely diagnosis.
Options: <1> Secondary cataract due to incomplete extraction of the lens. <2> Opacification of the posterior capsule. <3> Cystic macular edema. <4> Dislocation of intraocular lens to the vitreous cavity. <5> Late endophthalmitis.
Output:
2