essential to / for some to do something

Hi everybody,

Below is one of those highly controversial questions excerped from KPDS examination administered by OSYM in Turkey a couple of weeks ago.

I would kindly request you to make the 23rd question clear to me as to my mind,both "for" and "to" are two possible options. I just don't want to take up much space here giving copy-pasted examples in favour of "to".Though "for" is the one I went for, "to" is not that much far beyond reasonable.What do you think? (doesn't the question deserve to be called mutually exclusive?)

Intellectualization is an attempt to gain detachment from a stressful situation by confronting it in abstract, intellectual terms. This kind of defense is frequently a necessity for people who must (21) ....... life-and-death matters in their daily jobs. The doctor Who is continually confronted with human suffering cannot afford to become emotionally involved with (22) ....... patient. In fact, a certain amount of detachment may be essential (23) ......... the doctor to function competently. This kind of intellectualization is a problem only when it (24) ....... such a pervasive life-style (25) ....... individuals cut themselves off from all emotional experiences.

21. A) come apart B) use up C) show off D) turn down E) deal with

22. A) another B) some C) each D) few E) more

23. A) in B) with C) to D) for E) by

24. A) would become B) becomes C) became D) will become E) used to become

25. A) when B) if C) whether D) unless E) that