Question: One patient is diagnosed with a 4 cm lung cancer without pleural contact in the right upper lobe. The extension study reveals the presence of metastasis in right parahilar nodes, without evidence of distant metastasis. The staging of the tumor will be: 
 Options:  <1> Stage I. <2> Stage IIA. <3> Stage IIB. <4> Stage IIIA. <5> Stage IIIB.
2