**Core Concept**
Lathyrism is a neurolathyrism or osteolathyrism condition caused by the consumption of certain legumes belonging to the genus *Lathyrus*. This condition is characterized by neuromuscular symptoms, such as spastic paraparesis, and skeletal deformities. The underlying mechanism involves the presence of a toxin, Lathyrine or ODAP (oxalyldiaminopropionic acid), which interferes with glutamate metabolism.

**Why the Correct Answer is Right**
The correct answer is associated with the consumption of *Lathyrus sativus*, a legume that contains the toxin Lathyrine or ODAP. This toxin inhibits the enzyme glutamate decarboxylase (GAD), leading to an accumulation of glutamate in the nervous system. Glutamate is an excitatory neurotransmitter, and its excessive levels can cause overstimulation of neurons, resulting in neuromuscular symptoms and skeletal deformities.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it is not associated with lathyrism. The toxin responsible for lathyrism is ODAP, not aflatoxin.
**Option B:** This option is incorrect as it is not a known cause of lathyrism. The correct legume associated with lathyrism is *Lathyrus sativus*.
**Option C:** This option is incorrect as it is not associated with lathyrism. The toxin responsible for lathyrism is ODAP, not tetrodotoxin.

**Clinical Pearl / High-Yield Fact**
Consuming large quantities of *Lathyrus sativus* can lead to lathyrism, especially in areas where the legume is a staple food and alternative sources of protein are scarce.

**Correct Answer: D. Lathyrus sativus**