If Mani is taller than Tony but shorter than Deepak and Tony is just as tall as Mohan but taller than Gokul, then Mohan is:

Let's convert the given statements into heights inequalities:
1. "Mani is taller than Tony but shorter than Deepak":

$$\text{Deepak}>\text{Mani}>\text{Tony}$$

2. "Tony is just as tall as Mohan but taller than Gokul":

$$\text{Tony}=\text{Mohan}>\text{Gokul}$$

Combining both structural inequalities together:

$$\text{Deepak}>\text{Mani}>\text{Tony}=\text{Mohan}>\text{Gokul}$$

Let's evaluate the given options based on this arrangement:

* Option A: Mohan is just as tall as Mani (False, Mani is taller).
* Option B: Mohan is shorter than Tony (False, they are equal).
* Option C: Mohan is taller than Deepak (False, Deepak is the tallest).
* Option D: Mohan is shorter than Mani (True, since Mani > Tony and Tony = Mohan, it implies $\text{Mani}>\text{Mohan}$).