Vitamins are organic molecules required by the body in small quantities for metabolic activities.Based on their solubility, vitamins can be divided into 2 categories:Water-soluble - These easily dissolve in water. Example - Vitamin B complex and vitamin C.Fat-soluble - These do not dissolve in water. Example - Vitamins A, D, E and K.Deficiency of vitamins in the diet can cause various diseases or disorders in the human body.Vitamin B6 -It is also known as pyridoxine.It is a water-soluble vitamin like any other vitamin B.Its deficiency can cause convulsions, nausea and depression.Food rich in vitamin B6 are fish, organ meats, potatoes and starchy vegetables.Therefore, option (1) is the correct answer.Additional InformationVitamins & Deficiency Diseases:VitaminChemical NameDeficiency DiseasesARetinolNight blindness, XerophthalmiaB1ThiamineBeri-beriB2RiboflavinInflammation of tongue, sores in the corners of the mouthB3Niacin or Nicotinic acidPellagraB5Pantothenic acidFatigue, muscle crampB6PyridoxineAnaemia, nausea, depression, ConvulsionsB7BiotinThinning of Hair, Skin rashesB12CyanocobalaminPale skin, constipationCAscorbic acidScurvy, anaemiaDCalciferolRickets, osteomalaciaETocopherolMuscle and Nerve damageKPhylloquinone or NaphthoquinoneLack of Blood clotting