Definition: 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 65-year-old man with a history of pancreatic cancer undergoing chemotherapy. Emergency consultation for pain and edema of the entire lower limb from the groin. Which diagnostic test is more cost-effective to confirm the diagnostic suspicion? 
 Options:  <1> Dimer D. <2> Magnetic resonance. <3> Phlebography <4> Venous Doppler ultrasound. <5> Helical CT
