2011SP-II-11

Ans: C
$\begin{array}{rcl}
a_1 & = & 4 \\
a_2 & = & 5 \\
a_3 & = & 4 + 5 \\
& = & 9 \\
a_4 & = & 5 + 9 \\
& = & 14 \\
a_5 & = & 9 + 14 \\
& = & 23 \\
a_6 & = & 14 + 23 \\
& = & 37 \\
a_7 & = & 23 + 37 \\
& = & 60 \\
a_8 & = & 37 + 60 \\
& = & 97 \\
a_9 & = & 60 + 97 \\
& = & 157 \\
a_{10} & = & 97 + 157 \\
& = & 254
\end{array}$