Spot the correct spelling of a drug-effect psychology field.

The correct option is Psychopharmacology.

Let's break down the word into its etymological roots to understand its structure and correct spelling:
1. Psycho-: Derived from the Greek psukhē, meaning "mind", "soul", or "mental process".
2. Pharmaco-: Derived from the Greek pharmakon, meaning "drug", "medicine", or "potion".
3. -logy: Derived from the Greek -logia, denoting a field of study or science.

Combining these word parts in order yields Psychopharmacology, which is the scientific study of the effects of drugs on the mind and behavior.

Reviewing the common spelling pitfalls in the given options:
- "Psychopharmacolgy" is missing an 'o' before 'logy'.
- "Psychopharmocology" incorrectly uses an 'o' instead of an 'a' in the middle ('pharmoc' vs 'pharmac').
- "Psychopharmecology" incorrectly inserts 'ec' ('pharmec') instead of 'ac'.

Therefore, the correct and standard spelling is Psychopharmacology.