input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A scientist is studying the properties of myosin-actin interactions in a sample of human muscle tissue. She has identified a drug that selectively inhibits phosphate release by the myosin head. If she gives this drug to a sample of human muscle tissue under physiologic conditions, which of the following steps in cross-bridge cycling will most likely be blocked?   (A) Myosin head cocking   (B) Exposure of myosin-binding sites on actin   (C) Myosin head binding to actin   (D) Power stroke
output: ['(D) Power stroke <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Myosin head cocking  (B) Exposure of myosin-binding sites on actin  (C) Myosin head binding to actin  (D) Power stroke <> possible answers', '  A scientist is studying the properties of myosin-actin interactions in a sample of human muscle tissue. She has identified a drug that selectively inhibits phosphate release by the myosin head. If she gives this drug to a sample of human muscle tissue under physiologic conditions, which of the following steps in cross-bridge cycling will most likely be blocked? <> context']