<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 25-year-old male presents to his primary care physician for pain in his knee. The patient was in a wrestling match when his legs were grabbed from behind and he was taken to the floor. The patient states that the moment this impact happened, he felt a snapping and sudden pain in his knee. When the match ended and he stood back up, his knee felt unstable. Minutes later, his knee was swollen and painful. Since then, the patient claims that he has felt unstable bearing weight on the leg. The patient has no significant past medical history, and is currently taking a multivitamin and protein supplements. On physical exam you note a tender right knee, with erythema and an effusion. Which of the following is the most likely physical exam finding in this patient?? A: Laxity to valgus stress, B: Laxity to varus stress, C: Clicking and locking of the joint with motion, D: Anterior translation of the tibia relative to the femur, E: Posterior translation of the tibia relative to the femur,  <response>: Based on the description in the question stem, this patient likely sustained an acute knee injury during wrestling that resulted in sudden pain, swelling, and instability of the joint. The mechanism of injury described suggests a high likelihood of damage to stabilizing structures within the knee. The choices describe various physical exam maneuvers that can assess the integrity of specific knee ligaments and structures. Choice A valgus stress testing and Choice B varus stress testing assess the medial collateral ligament MCL and lateral collateral ligament LCL, respectively. Choice C describes mechanical symptoms suggestive of meniscal injury. Choices D and E describe anterior drawer testing and posterior drawer testing, which assess the anterior cruciate ligament ACL and posterior cruciate ligament PCL. Given the description of the injury occurring with the knee flexed and sudden twisting, the most likely damaged structure is the ACL. Therefore, increased anterior translation of the tibia on the femur during anterior drawer testing would be the expected physical exam finding.D: Anterior translation of the tibia relative to the femur 