Read the following passage carefully. P helps to maintain strong eyesight and healthy skin. Q is required for normal growth of bones and teeth in children. R is essential for proper functioning of muscles and nerves. S is needed for natural clotting of blood.Identify P, Q, R and S and select the incorrect statement regarding these.

• A. Q is produced when the skin is exposed to sunlight.            
• B. R is a mineral, deficiency of which causes spasms, poor digestion, anxiety and sleeplessness.            
• C. Cod liver oil is a good source of both P and S.            
• D. S is synthesized in our body by bacteria present in the gut.