Question: The Indian onion crisis of 2010 involved the dramatic rise in the cost of onions across markets in India, the crisis caused political tension in the country and was described as "a grave concern" by then Prime Minister Manmohan Singh, an Indian economist and politician who served as the Prime Minister of India from 2004 to when?
Sentence (from "2010 Indian onion crisis"): The crisis was caused by errant rainfall in the onion producing regions which led to a shortage of onion production.
Relevant evidence: No