Ashish is heavier than Govind. Mohit is lighter than Jack. Pawan is heavier than Jack but lighter than Govind.
Who among them is the heaviest ? 

Answer: D. Ashish

In terms of weight, we have :
Govind < Ashish,  Mohit < Jack,  Jack < Pawan,  Pawan < Govind.
So, the sequence becomes :
Mohit < Jack < Pawan < Govind < Ashish.
Clearly, Ashish is the heaviest.