The answer is pneumonia. Diplococci are paired spherical bacteria, and that pairing is exactly what's linked to pneumonia.
Strep throat comes from streptococci, which grow in chains, not pairs. Syphilis is caused by a spirochete, and tuberculosis comes from a rod-shaped bacillus. Knowing the shape tells you the bug — pairs mean diplococci, and diplococci means pneumonia.
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