Deficiency of vitamin 'X' causes bleeding of gums. This vitamin is essential for absorption of mineral 'Y' and 'X' is found in food 'Z'. Identify X, Y and Z.

• A. X-vitamin B, Y-calcium, Z-green leafy vegetables
• B. X-vitamin A, Y-phosphorus, Z-poultry products
• C. X-vitamin D, Y- calcium, Z-milk product
• D. X-vitamin C, Y-iron, Z-citrus fruits