Question: A 70-year-old man presented with progressive dyspnea and a non-productive cough several years old. In chest X-ray, pleural plaques are seen in the mediastinal and diaphragmatic pleura. On CT, these plaques are confirmed, also appreciating the presence of reticulonodulillar involvement predominantly in lower fields. Among the following, what attitude would you recommend in the first place? 
 Options:  <1> Complete your smoking history. <2> Inquire about occupational exposure. <3> Request blood tests to rule out eosinophilia. <4> Do complete respiratory functional tests. <5> Propose a transbronchial biopsy.
2