In which of the following cities is the number of male doctors less than the number of female doctors?

The male doctors are fewer than the female doctors in City F, so the answer is City F.

The total doctors in City F are 14 percent of 2400, which is 336.

The female doctors in City F are 19 percent of 900, which is 171.

So the male doctors in City F are 336 minus 171, which is 165.

Here 165 males is less than 171 females.

In the other cities the males outnumber the females.

So the answer is City F.