## Core Concept
Morphine is a opioid commonly abused by addicts. Various routes can be used for administration of morphine, including intravenous, intramuscular, subcutaneous, oral, and intranasal routes.

## Why the Correct Answer is Right
The correct answer is related to the route not typically used by addicts for morphine administration.

## Why Each Wrong Option is Incorrect
- **Option A:** Intravenous route is a common method used by addicts for administering drugs, including morphine, as it provides immediate effects.
- **Option B:** Intramuscular and subcutaneous routes can also be used for morphine administration, although they are less common than intravenous or oral routes.
- **Option C:** Oral route is frequently used for morphine administration in medical settings and can be exploited by addicts.
- **Option D:** Intranasal route, though less common, has been reported for some drug users.

## Clinical Pearl / High-Yield Fact
A key point to remember is that while addicts may use various routes for morphine, the **transdermal route** (patches) is less commonly associated with abuse due to the controlled release mechanism and difficulty in extracting the drug from the patch for immediate use.

## Correct Answer: D. Transdermal.