A sprained ankle means one or more ligaments on the outer side of your ankle were stretched or torn. If a sprain is not treated properly, you could have long-term problems. Typically the ankle is rolled either inward (inversion sprain) or outward (eversion sprain). Inversion sprains cause pain along the outer side of the ankle and are the most common type. Pain along the inner side of the ankle may represent a more serious injury to the tendons or to the ligaments that support the arch and should always be evaluated by a doctor.　　You're most likely to sprain your ankle when you have your toes on the ground and heel up (plantar flexion). This position puts your ankle's ligaments under tension, making them vulnerable. A sudden force like landing on an uneven surface may turn your ankle inward (inversion). When this happens, one, two or three of your ligaments may be hurt.　　A sprain can be difficult to differentiate from a fracture (broken bone) without an x-ray. If you are unable to bear weight after this type of injury, or if there is significant swelling or deformity, you should seek medical treatment from a doctor (MD or DO).  This may be your primary care physician or pediatrician, an emergency department, or an orthopaedist, depending on the severity of the injury. 
53.Which type of a sprained ankle is the most common one?
(A) inward sprain
(B) outward sprain
(C) eversion sprain
(D) toward sprain