The use of the phrase "fly in the ointment" can be traced to these lines from the bible:
dead flies cause the ointment of the apothecary to send forth a stinking savour: so doth a little folly him that is in reputation for wisdom and honour. (from eccl. 10: 1 king james version)
based on the context in the source, what is the most likely meaning of the phrase "fly in the ointment" in general use?
a) a foolish person who is considered wise
b) a minor flaw that ruins a person or object
c) an example of one man’s repeated poor judgment
d) a worthless person or object that people mistakenly value

Dead flies cause the ointment of the apothecary to send forth a stinking savour: so doth a little folly him that is in reputation for wisdom and honour. (from Eccl. 10:1 King James Version) 
Based on the context in the source, what is the most likely meaning of the phrase "fly in the ointment" in general use? 
fly
B) a minor flaw that ruins a person or object is the answer I would choose. The idea is that the fly which is in the ointment or perhaps in a soup, in itself is not a big problem but is serious enough to contaminate the ointment or say the soup or put people off by just the thought of it even though it is removed.

Same cause im in apex too