**Core Concept**
Humoral immunodeficiency refers to a condition where the body is unable to produce sufficient antibodies to fight off infections, primarily due to defects in B cells or the production of immunoglobulins. This type of immunodeficiency makes patients more susceptible to encapsulated bacterial infections.

**Why the Correct Answer is Right**
Infections that are typically seen in humoral immunodeficiency include those caused by encapsulated bacteria such as *Streptococcus pneumoniae*, *Haemophilus influenzae*, and *Neisseria meningitidis*. These bacteria have a polysaccharide capsule that is usually targeted by antibodies produced by B cells. Patients with humoral immunodeficiency are more prone to infections with these organisms due to their impaired ability to produce antibodies.

**Why Each Wrong Option is Incorrect**
**Option A:** would be consistent with the diagnosis as *Pseudomonas aeruginosa* is a common pathogen in patients with humoral immunodeficiency, particularly those with chronic granulomatous disease (CGD).

**Option B:** would be consistent with the diagnosis as *Candida albicans* is a common fungal pathogen that can cause infections in patients with humoral immunodeficiency.

**Option C:** would be consistent with the diagnosis as *Aspergillus fumigatus* is a common fungal pathogen that can cause infections in patients with humoral immunodeficiency.

**Option D:** is the correct answer as *Mycobacterium tuberculosis* is a bacterium that is primarily controlled by cell-mediated immunity, which is a different aspect of the immune system. Patients with humoral immunodeficiency may not be more susceptible to infections with *M. tuberculosis*.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that humoral immunodeficiency primarily affects the body's ability to produce antibodies, making patients more susceptible to encapsulated bacterial infections.

**Correct Answer: D. Mycobacterium tuberculosis**