In a code language, if '265' is written as 'PNH', '187' is written as 'OXB', and '248' is written as 'NUB', then which of the following letters represents the number '4'?

U

Given; In a code language, if '265' is written as 'PNH', '187' is written as 'OXB', and '248' is written as 'NUB'.

So,

265 -> PNH

187 -> OXB

248 -> NUB

Thus, 4 is not mentioned in above codes, so now we have to find a letter code which is also not mentioned in above codes

Hence, that is U