Non specific esterase is positive in all the categories of AML except –

**Core Concept**
The question is based on the **histochemical staining** properties of different types of Acute Myeloid Leukemia (AML) cells. Non-specific esterase (NSE) is an enzyme used as a marker in the diagnosis of certain types of leukemia.

**Why the Correct Answer is Right**
NSE is typically positive in monocytic lineage cells, which corresponds to certain subtypes of AML, such as **AML-M4** and **AML-M5**. However, it is usually negative in other types of AML that do not have monocytic differentiation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the details of the options are not provided, but generally, NSE positivity is expected in monocytic lineages.
**Option B:** Similarly, without the specifics, we can't directly address why it's incorrect, but typically, options that are not related to monocytic lineage would be incorrect if they claim NSE positivity.
**Option C:** Again, lacking specifics, but if an option suggests NSE positivity in a non-monocytic lineage AML, it would be incorrect.
**Option D:** Assuming this is the option that represents an AML subtype without monocytic differentiation, it would be correct that NSE is negative in this category.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **non-specific esterase** staining is particularly useful in identifying cells of monocytic lineage, making it a helpful tool in the diagnosis of specific subtypes of AML.

**Correct Answer:** D. AML-M3.