The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Brittle bone syndrome is caused by   (A) Improper synthesis of procollagen   (B) Polymerisation of collagen   (C) Increased osteoclastic activity   (D) Increased fibroblastic activity
['(A) Improper synthesis of procollagen <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Improper synthesis of procollagen \n (B) Polymerisation of collagen \n (C) Increased osteoclastic activity \n (D) Increased fibroblastic activity <> possible answers', '  Brittle bone syndrome is caused by <> context@']