Choose the correct one-word substitution for the following description
communicable disease that can spread rapidly from person to person through direct contact

Correct option is B

The correct one-word for the given group of words is (b) Contagious.
A contagious disease is one that spreads easily by direct contact from person to person—exactly matching the description. (Hindi: संसर्गजन्य, जो सीधे संपर्क से फैलता है।)
Example: Chickenpox is highly contagious, so patients should avoid close contact with others.
Meanings of the given other options:
· Eczema: A noninfectious inflammatory skin condition causing itching and rashes. (Hindi: एक्ज़िमा/चर्म-शोथ)
· Infectious: Caused by pathogens and capable of spreading, but not necessarily by direct contact only; transmission may be via vectors/air/etc. (Hindi: संक्रामक)
· Fatal: Leading to death; deadly. (Hindi: घातक)