Which of the following secondary metabolites are wrongly matched with their categories?
A. Toxin - Ricin
B. Drug - Curcumin
C. Alkaloid - Codeine
D. Lectin - Abrin

Options

A. Only A
B. A and B both
C. A and C both
D. Only D

Answer

To solve the question regarding which secondary metabolites are wrongly matched with their categories, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Option A: Toxin - Ricin**
- Ricin is a highly potent toxin derived from the seeds of the castor bean plant (Ricinus communis). It is classified as a lectin (a carbohydrate-binding protein) but is also recognized for its toxic properties. Thus, this match is correct.

2. **Option B: Drug - Curcumin**
- Curcumin is a chemical compound found in turmeric (Curcuma longa) and is widely used for its medicinal properties, particularly for its anti-inflammatory effects. It is indeed classified as a drug, especially in herbal medicine contexts. Therefore, this match is also correct.

3. **Option C: Alkaloid - Codeine**
- Codeine is an alkaloid derived from the opium poppy (Papaver somniferum). It is used as a pain reliever and is classified as an opiate. This match is correct as well.

4. **Option D: Lectin - Abrin**
- Abrin is a highly toxic protein derived from the seeds of the rosary pea plant (Abrus precatorius). While it is toxic, it is not classified as a lectin; instead, it is classified as a toxic albumin. Therefore, this match is incorrect.

### Conclusion:
The wrongly matched secondary metabolite is **Option D: Lectin - Abrin**.

### Final Answer:
**D. Lectin - Abrin**

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