Which_of_the_following_is_false_statement?$

• A. ‚âà√≠¬¨¬±-Keratin is ‚âà√≠¬¨¬± helical
• B. Collagen is ‚âà√≠¬¨¬± helical
• C. Hemoglobin has a quaternary structure
• D. ‚âà√≠¬¨¬±-Keratin is ‚âà√≠‚Äö√¢¬ß pleated structure