In Gout true statement is

• A. Presence of Monosodium urate positively bifringent crystals in synovium
• B. Presence of Monosodium urate negatively bifringent crystals in synovium
• C. Presence of calciumpyrophosphate crystals positively bifringent crystals in synovium
• D. Presence of calcium pyrophosphate crystals negatively bifringent crystals in the synovium