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The simplest dyons in the toroidal compactifications of type IIB
string theory correspond to non-trivial dilaton, NS two form and
metric in 10D. Presuming that the NS two form can be considered as
torsion (MT conjecture), we construct all the cubic alpha-prime
corrections from the known R^4 corrections before utilizing Sen's
formalism to evaluate the cubic alpha-prime corrections to the entropy
of such simplest dyon. These corrections are found non-vanishing. On
the contrary, we argue that the strong OSV conjecture implies they
should be vanishing. This conflict validates only one of the strong
OSV conjecture or the strong MT conjecture.
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