The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Skeletal muscles:   (A) Contracts when calcium is taken up by sacroplasmic reticulum   (B) Contracts when actin and myosin filaments shorten   (C) Contraction is initiated by calcium binding to troponin   (D) Contraction is initiated by calcium binding to tropomyosin
['(C) Contraction is initiated by calcium binding to troponin <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Contracts when calcium is taken up by sacroplasmic reticulum \n (B) Contracts when actin and myosin filaments shorten \n (C) Contraction is initiated by calcium binding to troponin \n (D) Contraction is initiated by calcium binding to tropomyosin <> possible answers', '  Skeletal muscles: <> context@']