Deepak, I ride a road bike with 5 inches of drop and am quite comfortable.
Contrary to what most people think drop can be pretty irrelevant compared to reach.
Reach is everything... everything.
If you buy a bike that is too long not matter how high or low the bars are you will never be comfortable.
My personal experience is that many people end up with a LHT that is at least a size too big because of the outrageously long top tube. We have had women come into our shop totally uncomfortable with the handlebars in the sky. We throw the bike in the trainer and can only conclude it is impossible to make the reach short enough because the bars would have to be at the steartube etc... I see it all the time.
If you buy a 54... don't way I didn't warn you.
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1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear