input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** If sodium channel inactivation is prolonged then which property of nerve conduction is hampered?   (A) Decreased relative refractory period   (B) Increased conduction blockade   (C) Increased upward stroke velocity   (D) Decreased downward stroke velocity of refractory period.
output: ['(C) Increased upward stroke velocity <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Decreased relative refractory period  (B) Increased conduction blockade  (C) Increased upward stroke velocity  (D) Decreased downward stroke velocity of refractory period. <> possible answers', '  If sodium channel inactivation is prolonged then which property of nerve conduction is hampered? <> context']