Roshan is taller than Hardik who is shorter than Sushil. Niza is taller than Harry but shorter than Hardik. Sushil is shorter than Roshan. Who is the tallest?

According to question,
Roshan is taller than Hardik who is shorter than Sushil.
R > Hardik But Hardik < S.
Niza is taller than Harry but shorter than Hardik.
N > Harry But N < Hardik
Sushil is shorter than Roshan.
S < R
Descending order of the heights is as
Roshan > Sushil > Hardik > Niza > Harry.
Therefore, the tallest person is Roshan.