This is a letter pattern riddle. Looking at the Hindi words, no single letter appears in all three: DIL (D, I, L), MANN (M, A, N, N), DHADKAN (D, H, A, D, K, A, N). Letters like 'A' and 'N' appear in two words but not all three. 'None of these' is correct because there's no single letter common to all.