Warburg-Dickens pathway is

Options

A. Kreb's cycle
B. PPP
C. Glycolysis
D. All of these

Answer

### Step-by-Step Solution:

1. **Understanding the Warburg-Dickens Pathway**: The Warburg-Dickens pathway is another name for the Pentose Phosphate Pathway (PPP). It is essential to recognize that this pathway is involved in the production of NADPH and ribulose 1,5-bisphosphate.

2. **Identifying the Function of the Pathway**: The primary function of the Warburg-Dickens pathway is to generate NADPH, which is crucial for anabolic reactions, including fatty acid synthesis and other biomolecule syntheses.

3. **Differentiating from Other Pathways**: It is important to differentiate the Warburg-Dickens pathway from other metabolic pathways:
- **CREB Cycle**: Also known as the TCA cycle or Krebs cycle, it occurs in the inner mitochondrial membrane and requires oxygen.
- **Glycolysis**: Known as the EMP pathway, named after its discoverers (Emden, Meyerhof, and Paranas), it is not the same as the Warburg-Dickens pathway.

4. **Conclusion**: Since the Warburg-Dickens pathway is synonymous with the Pentose Phosphate Pathway, the correct answer to the question is that it is indeed the Pentose Phosphate Pathway.

### Final Answer:
The Warburg-Dickens pathway is the Pentose Phosphate Pathway (PPP).

---