Get Values Separated By Comma

Hello, I need your advice.
Here's my scenario.

Table A
------------
id name
100 apple
115 grape
125 tomato
145 melon


Table B
-------------
id Fruits
11 100, 115, 145
12 125, 115
13 100


I thought i could get the list of fruits using this statement:

select name
from A where id IN (select fruits from B where id = 11)

But apparently not, it's working if
select name
from A where id IN (select fruits from B where id = 13)

That means it does not recognize values seperated by comma. Anyone who has any idea how to make it work?

Thanks in advance.

HS.