The correct option is C 15
As per the census 2011, the sex ratio of Tamil Nadu is 996 females per 1000 males. 15 districts of Tamil Nadu have more females than males. These are Ariyalur, Kanniyakumari, Karur, Nagapattinam, Perambalur, Pudukkoottai, Shivaganga, The Nilgiris, Thiruvarur, Thoothukudi, Thanjavur, Tiruchirappalli, Tirunelveli, Vellore, Virudhunagar.