# Lateral branches of stem are :-

$\begin{array}{1 1}(A)\;\text{Endogenous in origin}\\(B)\;\text{Exogenous in origin}\\(C)\;\text{Both}\\(D)\;\text{None of these}\end{array}$

Lateral stem is an extension of general cortex,which are outside endogenous and hence the origin of lateral stem is exogenous
Hence (B) is the correct answer.