input: Text: (A) Colonel Walsh is Major Polk’s senior officer. Their relationship became contentious in boot camp, when Walsh reported Polk for falling asleep on the job. (B) Colonel Walsh is Major Polk’s ex best friend. Their relationship became contentious during the Terran occupation of Mars, when Polk realized Walsh was prejudiced against Martian natives. (C) Colonel Polk is Major Walsh’s ex best friend. Their relationship became contentious in boot camp, when Polk reported Walsh for falling asleep on the job. (D) Colonel Walsh is Major Polk’s senior officer. Their relationship became contentious in boot camp, when Polk reported Walsh for falling asleep on the job. A PLANET NAMED JOE By S. A. LOMBINO There were more Joes on Venus than you could shake a ray-gun at. Perhaps there was method in Colonel Walsh's madness—murder-madness—when he ordered Major Polk to scan the planet for a guy named Joe. Colonel Walsh had a great sense of humor. I hated his guts ever since we went through the Academy together, but he had a great sense of humor. For example, he could have chosen a Second Looie for the job on Venus. He might even have picked a Captain. But he liked me about as much as I liked him, and so he decided the job was just right for a Major. At least, that's what he told me. I stood at attention before his desk in the Patrol Station. We were somewhere in Area Two on Earth, takeoff point for any operations in Space II. The duty was fine, and I liked it a lot. Come to think of it, the most I ever did was inspect a few defective tubes every now and then. The rest was gravy, and Colonel Walsh wasn't going to let me get by with gravy. "It will be a simple assignment, Major," he said to me, peering over his fingers. He held them up in front of him like a cathedral. "Yes, sir," I said. "It will involve finding one man, a Venusian native." I wanted to say, "Then why the hell don't you send
  Question: What is the relationship between Polk and Walsh? What is the central complication in their history together?
  Answer:
output: Colonel Walsh is Major Polk’s senior officer. Their relationship became contentious in boot camp, when Polk reported Walsh for falling asleep on the job.