True yeasts produce which one of the following in the asexual stage?

True yeasts are classified under the kingdom Fungi, and they primarily reproduce asexually through a process called budding. In this process, the parent yeast cell forms a small, new cell called a blastoconidium. This structure is a direct result of the unicellular nature of yeasts, which allows them to bud off from the parent organism rather than forming larger multicellular structures like hyphae.

Blastoconidia are often recognized as the characteristic spores produced during the asexual reproduction of yeasts, making them essential for their life cycle and propagation. They can then develop into new yeast cells under suitable environmental conditions. Understanding the reproductive strategies and structures of fungi such as yeasts is crucial for identifying and classifying them in microbiology.

The other options, while they represent forms of reproduction or differentiation in fungi, do not pertain specifically to true yeasts' primary asexual reproduction method. Pseudohyphae, for example, are typically associated with Candida species when they are in a transitional growth phase between yeast and mold forms, whereas chlamydospores and microconidia are associated with various filamentous fungi rather than true yeasts.