Following are the properties of four minerals P, Q, R and S. identify them and select the correct option. P: It is required for proper functioning of thyroid gland. Q: It helps in maintaining body's water balance, R: It is important for haemoglobin formation. S: It strengthens bones and teeth and helps in blood clotting.

• A. Deficiency of P causes dryness of eyes and inflammation of tongue,  
• B. O is also required for the proper functioning of nervous system.         
• C. (c) Deficiency of R causes goitre.        
• D. (d) S also helps to fight infections and keeps skin and mouth healthy.